#420. Light.—N. light, ray, beam, stream, gleam, streak, pencil; sunbeam, moonbeam; aurora. day; sunshine; light of day, light of heaven; moonlight, starlight, sun &c. (luminary) 432 light; daylight, broad daylight, noontide light; noontide, noonday, noonday sun. glow &c. v.; glimmering &c. v.; glint; play of light, flood of light; phosphorescence, lambent flame. flush, halo, glory, nimbus, aureola. spark, scintilla; facula; sparkling &c. v.; emication|, scintillation, flash, blaze, coruscation, fulguration[obs3]; flame &c. (fire) 382; lightning, levin[obs3], ignis fatuus[Lat], &c. (luminary) 423. luster, sheen, shimmer, reflexion[Brit], reflection; gloss, tinsel, spangle, brightness, brilliancy, splendor; effulgence, refulgence; fulgor[obs3], fulgidity[obs3]; dazzlement[obs3], resplendence, transplendency[obs3]; luminousness &c. adj.; luminosity; lucidity; renitency|, nitency[obs3]; radiance,, radiation; irradiation, illumination. actinic rays, actinism; Roentgen-ray, Xray; photography, heliography; photometer &c. 445. [Science of light] optics; photology[obs3], photometry; dioptrics[obs3], catoptrics[obs3]. [Distribution of light] chiaroscuro, clairobscur[obs3], clear obscure, breadth, light and shade, black and white, tonality. reflection, refraction, dispersion; refractivity. V. shine, glow, glitter; glister, glisten; twinkle, gleam; flare, flare up; glare, beam, shimmer, glimmer, flicker, sparkle, scintillate, coruscate, flash, blaze; be bright &c. adj.; reflect light, daze, dazzle, bedazzle, radiate, shoot out beams; fulgurate. clear up, brighten. lighten, enlighten; levin[obs3]; light, light up; irradiate, shine upon; give out a light, hang out a light; cast light upon, cast light in, throw light upon, throw light in, shed light upon, shed luster upon; illume[obs3], illumine, illuminate; relume[obs3], strike a light; kindle &c. (set fire to) 384. Adj. shining &c. v.; luminous, luminiferous[obs3]; lucid, lucent, luculent[obs3], lucific[obs3], luciferous; light, lightsome; bright, vivid, splendent[obs3], nitid[obs3], lustrous, shiny, beamy[obs3], scintillant[obs3], radiant, lambent; sheen, sheeny; glossy, burnished, glassy, sunny, orient, meridian; noonday, tide; cloudless, clear; unclouded, unobscured[obs3]. gairish[obs3], garish; resplendent, transplendent[obs3]; refulgent, effulgent; fulgid[obs3], fulgent[obs3]; relucent[obs3], splendid, blazing, in a blaze, ablaze, rutilant[obs3], meteoric, phosphorescent; aglow. bright as silver; light as day, bright as day, light as noonday, bright as noonday, bright as the sun at noonday. actinic; photogenic[obs2], graphic; heliographic; heliophagous[obs3]. Phr. "a day for gods to stoop and men to soar" [Tennyson]; "dark with excessive bright" [Milton].

#421. Darkness.—N. darkness &c. adj., absence of light; blackness &c. (dark color) 431; obscurity, gloom, murk; dusk &c. (dimness) 422. Cimmerian darkness[obs3], Stygian darkness, Egyptian darkness; night; midnight; dead of night, witching hour of night, witching time of night; blind man's holiday; darkness visible, darkness that can be felt; palpable obscure; Erebus[Lat]; "the jaws of darkness" [Midsummer Night's Dream]; "sablevested night" [Milton]. shade, shadow, umbra, penumbra; sciagraphy[obs3]. obscuration; occultation, adumbration, obumbration[obs3]; obtenebration[obs3], offuscation|, caligation|; extinction; eclipse, total eclipse; gathering of the clouds. shading; distribution of shade; chiaroscuro &c. (light) 420. noctivagation[obs3]. [perfectly black objects] black body; hohlraum[Phys]; black hole; dark star; dark matter, cold dark matter. V. be dark &c. adj. darken, obscure, shade; dim; tone down, lower; overcast, overshadow; eclipse; obfuscate, offuscate|; obumbrate[obs3], adumbrate; cast into the shade becloud, bedim[obs3], bedarken[obs3]; cast a shade, throw a shade, spread a shade, cast a shadow, cast a gloom, throw a shadow, spread a shadow, cast gloom, throw gloom, spread gloom. extinguish; put out, blow out, snuff out; doubt. turn out the lights, douse the lights, dim the lights, turn off the lights, switch off the lights. Adj. dark, darksome[obs3], darkling; obscure, tenebrious[obs3], sombrous[obs3], pitch dark, pitchy, pitch black; caliginous[obs3]; black &c. (in color) 431. sunless, lightless &c. (see sun[obs3], light, &c. 423); somber, dusky; unilluminated &c. (see illuminate &c. 420)[obs3]; nocturnal; dingy, lurid, gloomy; murky, murksome[obs3]; shady, umbrageous; overcast &c. (dim) 422; cloudy &c. (opaque) 426; darkened; &c. v. dark as pitch, dark as a pit, dark as Erebus[Lat]. benighted; noctivagant!|, noctivagous!|. Adv. in the dark, in the shade. Phr. "brief as the lightning in the collied night" [M. N. D.]; "eldest Night and Chaos, ancestors of Nature" [P. L.]; "the blackness of the noonday night" [Longfellow]; "the prayer of Ajax was for light" [Longfellow].

#422. Dimness.—N. dimness &c. adj.; darkness &c. 421; paleness &c.
(light color) 429.
half light, demi-jour; partial shadow, partial eclipse; shadow of a
shade; glimmer, gliming[obs3]; nebulosity; cloud &c. 353; eclipse.
aurora, dusk, twilight, shades of evening, crepuscule, cockshut time|;
break of day, daybreak, dawn.
moonlight, moonbeam, moonglade[obs3], moonshine; starlight, owl's
light, candlelight, rushlight, firelight; farthing candle.
V. be dim, grow dim &c. adj.; flicker, twinkle, glimmer; loom, lower;
fade; pale, pale its ineffectual fire [Hamlet].
render dim &c. adj.; dim, bedim[obs3], obscure; darken, tone down.
Adj. dim, dull, lackluster, dingy, darkish, shorn of its beams, dark
421.
faint, shadowed forth; glassy; cloudy; misty &c. (opaque) 426; blear;
muggy|, fuliginous[obs3]; nebulous, nebular; obnubilated[obs3], overcast,
crepuscular, muddy, lurid, leaden, dun, dirty; looming &c. v.
pale &c. (colorless) 429; confused &c. (invisible) 447.

#423. [Source of light, self-luminous body.] Luminary.—N. luminary; light &c. 420; flame &c. (fire) 382. spark, scintilla; phosphorescence, fluorescence. sun, orb of day, Phoebus, Apollo[obs3], Aurora; star, orb; meteor, falling star, shooting star; blazing star, dog star, Sirius; canicula, Aldebaran[obs3]; constellation, galaxy; zodiacal light; anthelion[obs3]; day star, morning star; Lucifer; mock sun, parhelion; phosphor, phosphorus; sun dog|!; Venus. aurora, polar lights; northern lights, aurora borealis; southern lights, aurora australis. lightning; chain lightning, fork lightning, sheet lightning, summer lightning; ball lightning, kugelblitz [German]; [chemical substances giving off light without burning] phosphorus, yellow phosphorus; scintillator, phosphor; firefly luminescence. ignis fatuus[Lat]; Jack o'lantern, Friar's lantern; will-o'-the-wisp, firedrake[obs3], Fata Morgana[Lat]; Saint Elmo's fire. [luminous insects] glowworm, firefly, June bug, lightning bug. [luminous fish] anglerfish. [Artificial light] gas; gas light, lime light, lantern, lanthorn[obs3]; dark lantern, bull's-eye; candle, bougie[Fr], taper, rushlight; oil &c. (grease) 356; wick, burner; Argand[obs3], moderator, duplex; torch, flambeau, link, brand; gaselier[obs3], chandelier, electrolier[obs3], candelabrum, candelabra, girandole[obs3], sconce, luster, candlestick. [non-combustion based light sources] lamp, light; incandescent lamp, tungsten bulb, light bulb; flashlight, torch[Brit]; arc light; laser; maser [microwave radiation]; neon bulb, neon sign; fluorescent lamp. [parts of a light bulb] filament; socket; contacts; filler gas. firework, fizgig[obs3]; pyrotechnics; rocket, lighthouse &c. (signal) 550. V. illuminate &c. (light) 420. Adj. self-luminous, glowing; phosphoric|!, phosphorescent, fluorescent; incandescent; luminescent, chemiluminescent; radiant &c. (light) 420. Phr. "blossomed the lovely stars, the forget-me-nots of the angels" [Longfellow]; "the sentinel stars set their watch in the sky" [Campbell]; "the planets in their station list'ning stood" [Paradise Lost]; "the Scriptures of the skies" [Bailey]; "that orbed continent, the fire that severs day from night" [Twelfth Night].

#424. Shade.—N. shade; awning &c. (cover) 223; parasol, sunshade,
umbrella; chick; portiere; screen, curtain, shutter, blind, gauze, veil,
chador, mantle, mask; cloud, mist, gathering. of clouds.
umbrage, glade; shadow &c. 421.
beach umbrella, folding umbrella.
V. draw a curtain; put up a shutter, close a shutter; veil &c. v.;
cast a shadow &c. (darken) 421.
Adj. shady, umbrageous.
Phr. "welcome ye shades! ye bowery thickets hail" [Thomson].

#425. Transparency.—N. transparence, transparency; clarity; translucence, translucency; diaphaneity[obs3]; lucidity, pellucidity[obs3], limpidity; fluorescence; transillumination, translumination[obs3]. transparent medium, glass, crystal, lymph, vitrite[obs3], water. V. be transparent &c. adj.; transmit light. Adj. transparent, pellucid, lucid, diaphanous, translucent, tralucent|, relucent[obs3]; limpid, clear, serene, crystalline, clear as crystal, vitreous, transpicuous[obs3], glassy, hyaline; hyaloid[Med], vitreform[obs3].

#426. Opacity.—N. opacity; opaqueness &c. adj.
film; cloud &c. 353.
V. be opaque &c. adj.; obstruct the passage of light; obfuscate,
offuscate|.
Adj. opaque, impervious to light; adiaphanous[obs3]; dim &c. 422;
turbid, thick, muddy, opacous|, obfuscated, fuliginous[obs3], cloud, hazy,
misty, foggy, vaporous, nubiferous[obs3], muggy|| (turbidity) 426a.
smoky, fumid[obs3], murky, dirty.

#426a. Turbidity—N. turbidity, cloudiness, fog, haze, muddiness,
haziness, obscurity.
nephelometer[instrument to measure turbidity].
Adj. turbid, thick, muddy, obfuscated, fuliginous[obs3], hazy, misty,
foggy, vaporous, nubiferous[obs3]; cloudy (cloud) 353.
smoky, fumid[obs3], murky, dirty.

#427. Semitransparency.—N. semitransparency, translucency,
semiopacity; opalescence, milkiness, pearliness[obs3]; gauze, muslin; film;
mica, mother-of-pearl, nacre; mist &c. (cloud) 353.
[opalescent jewel] opal.
turbidity &c. 426a.
Adj. semitransparent, translucent, semipellucid[obs3],
semidiaphanous[obs3], semiopacous[obs3], semiopaque; opalescent,
opaline[obs3]; pearly, milky; frosted, nacreous.
V. opalesce.

(ii) SPECIFIC LIGHT