Operose, op′ėr-ōz, adj. laborious: tedious.—adv. Op′erosely.—ns. Op′eroseness, Operos′ity.
Ophicleide, of′i-klīd, n. a large bass trumpet, with a deep pitch. [Fr.; coined from Gr. ophis, a serpent, kleis, kleidos, a key.]
Ophidian, o-fid′i-an, n. one of the true serpents, in which the ribs are the only organs of locomotion.—adjs. Ophid′ian, Ophid′ious, pertaining to serpents: having the nature of a serpent.—ns. Ophidiā′rium, a place where serpents are confined; Ophiog′raphy, the description of serpents; Ophiol′ater, a serpent-worshipper.—adj. Ophiol′atrous.—n. Ophiol′atry, serpent-worship.—adjs. Ophiolog′ic, -al.—ns. Ophiol′ogist, one versed in ophiology; Ophiol′ogy, the study of serpents; Oph′iomancy, divination by serpents.—adjs. Ophiomor′phic, Ophiomor′phous, having the form of a serpent; Ophioph′agous, feeding on serpents.—n. Oph′ite, one of a Gnostic sect who worshipped the serpent. [Gr. ophidion, dim. of ophis, opheōs, a serpent.]
Ophiura, of-i-ū′ra, n. a genus of sand-stars.—ns. and adjs. Ophiū′ran; Ophiū′roid. [Gr. ophis, serpent, oura, tail.]
Ophthalmia, of-thal′mi-a, n. inflammation of the eye—also Ophthal′my.—adj. Ophthal′mic, pertaining to the eye.—ns. Ophthal′mist, Ophthalmol′ogist, one skilled in ophthalmology; Ophthalmī′tis, inflammation of the eyeball; Ophthalmodyn′ia, pain, esp. rheumatic pain, of the eye; Ophthalmog′raphy, a description of the eye.—adjs. Ophthalmolog′ic, -al.—ns. Ophthalmol′ogy, the science of the eye, its structure and functions; Ophthalmom′eter, an instrument for eye-measurements; Ophthalmom′etry, the making of such; Ophthalmoplē′gia, paralysis of one or more of the muscles of the eye; Ophthal′moscope, an instrument for examining the interior of the eye.—adjs. Ophthalmoscop′ic, -al.—adv. Ophthalmoscop′ically.—ns. Ophthal′moscopy, examination of the interior of the eye with the ophthalmoscope; Ophthalmot′omy, dissection of the eye: an incision into the eye. [Gr.,—ophthalmos, eye.]
Opiate, ō′pi-āt, n. a drug containing opium to induce sleep: that which dulls sensation, physical or mental.—adj. inducing sleep.—adj. O′piated.
Opine, o-pīn′, v.i. to suppose.—adj. Opin′able, capable of being thought.—ns. Opī′nant, one who forms an opinion; Opin′icus (her.), a half-lion, half-dragon. [Fr.,—L. opināri, to think.]
Opinion, ō-pin′yun, n. one's belief, judgment: favourable estimation: (Shak.) opinionativeness.—adjs. Opin′ionable, that may be matter of opinion; Opin′ionāted, Opin′ioned, firmly adhering to one's own opinions.—adv. Opin′ionātely (obs.).—adj. Opin′ionātive, unduly attached to one's own opinions: stubborn.—adv. Opin′ionātively.—ns. Opin′ionātiveness; Opin′ionist. [L.]
Opisometer, op-i-som′e-tėr, n. an instrument for measuring curved lines on a map. [Gr. opisō, backward, metron, measure.]
Opisthobranchiate, ō-pis-thō-brang′ki-āt, adj. having the gills behind the heart—n. Opisthobranch′ism.