Erbium, er′bi-um, n. a rare metal, the compounds of which are present in the mineral gadolinite, found at Ytterby in Sweden. [From Ytterby.]

Ere, ār, adv. before, sooner.—prep. before.—conj. sooner than.—advs. Erelong′, before long: soon; Erenow′, before this time; Erewhile′, formerly: some time before. [A.S. ǽr; cf. Dut. eer.]

Erebus, er′e-bus, n. (myth.) the dark and gloomy cavern between earth and Hades: the lower world, hell. [L.,—Gr. Erebos.]

Erect, e-rekt′, v.t. to set upright: to raise: to build: to exalt: to establish.—adj. upright: directed upward.—adj. Erect′ed.—ns. Erect′er, Erect′or, one who, or that which, erects or raises: a muscle which assists in erecting a part or an organ: an attachment to a compound microscope for making the image erect instead of inverted.—adj. Erect′ile, that may be erected.—ns. Erectil′ity, quality of being erectile; Erec′tion, act of erecting: state of being erected: exaltation: anything erected: a building of any kind.—adj. Erect′ive, tending to erect.—adv. Erect′ly.—n. Erect′ness. [L. erectus, erigĕre, to set upright—e, out, regĕre, to direct.]

Eremacausis, er-e-ma-kaw′sis, n. (chem.) slow combustion or oxidation. [Gr. erema, slowly, kausiskaiein, to burn.]

Eremite, er′e-mīt, n. a recluse who lives apart, from religious motives: a hermit.—adjs. Eremit′ic, -al.—n. Er′emitism, state of being an eremite. [Late L.,—Gr. erēmos, desert.]

Erethism, er′e-thizm, n. excitement or stimulation of any organ.—adjs. Erethis′mic, Erethis′tic, Erethit′ic. [Gr.]

Erf, erf, n. a garden-plot in South Africa. [Dut.]

Erg, erg, n. the unit of work in the centimetre-gramme-second system—that is, the quantity of work done by a force which, acting for one second upon a mass of one gramme, produces a velocity of one centimetre per second. [Gr. erg-on, work.]

Ergo, ėr′go, adv. (logic) therefore, used to mark the conclusion of a syllogism.—v.i. Er′gotise, to wrangle. [L. ergo, therefore.]