Orthotomic circle(Geom.), that circle which cuts three given circles at right angles.

(Or*thot"o*mous) a. (Crystallog.) Having two cleavages at right angles with one another.

(Or*thot"o*my) n. (Geom.) The property of cutting at right angles.

(Or"tho*tone) a. [Ortho- + Gr. tone, accent.] (Gr. Gram.) Retaining the accent; not enclitic; — said of certain indefinite pronouns and adverbs when used interrogatively, which, when not so used, are ordinarilly enclitic.

(Or*thot"ro*pal Or*thot"ro*pous) a. [Ortho- + Gr. to turn: cf. F. orthotrope.] (Bot.) Having the axis of an ovule or seed straight from the hilum and chalaza to the orifice or the micropyle; atropous.

This word has also been used (but improperly) to describe any embryo whose radicle points towards, or is next to, the hilum.

(Or`tho*trop"ic) a. [See Orthotropal.] (Bot.) Having the longer axis vertical; — said of erect stems. Encyc. Brit.

(Or`tho*xy"lene) n. [Ortho- + xylene.] (Chem.) That variety of xylene in which the two methyl groups are in the ortho position; a colorless, liquid, combustible hydrocarbon resembling benzene.

(Or"tive) a. [L. ortivus, fr. oriri, ortus, to rise: cf. F. ortive.] Of or relating to the time or act of rising; eastern; as, the ortive amplitude of a planet.

(Or"to*lan) n. [F., fr. It. ortolano ortolan, gardener, fr. L. hortulanus gardener, fr. hortulus, dim. of hortus garden. So called because it frequents the hedges of gardens. See Yard an inclosure, and cf. Hortulan.] (Zoöl.) (a) A European singing bird about the size of the lark, with black wings. It

Orthopteran to Osmic

(Or*thop"ter*an) n. (Zoöl.) One of the Orthoptera.

(Or*thop"ter*ous) a. (Zoöl.) Of or pertaining to the Orthoptera.

(Or`tho*rhom"bic) a. [Ortho- + rhombic.] (Crystallog.) Noting the system of crystallization which has three unequal axes at right angles to each other; trimetric. See Crystallization.

(Or"tho*scope) n. [Ortho- + -scope.] (Physyol.) An instrument designed to show the condition of the superficial portions of the eye.

(Or`tho*scop"ic) a. (Opt.) Giving an image in correct or normal proportions; giving a flat field of view; as, an orthoscopic eyepiece.

(Or`tho*si*lic"ic) a. [Ortho- + silicic.] (Chem.) Designating the form of silicic acid having the normal or highest number of hydroxyl groups.

(Or`tho*sper"mous) a. [Ortho- + Gr. seed.] (Bot.) Having the seeds straight, as in the fruits of some umbelliferous plants; — opposed to cœlospermous. Darwin.

(Or"tho*stade) n. [Gr. 'orqo`s straight + to place.] (Anc. Costume) A chiton, or loose, ungirded tunic, falling in straight folds.

(Or*thos"ti*chy) n.; pl. Orthostichies [Ortho- + Gr. row.] (Bot.) A longitudinal rank, or row, of leaves along a stem.

(Or`tho*tom"ic) a. [Ortho- + Gr. to cleave.] (Geom.) Cutting at right angles.

  By PanEris using Melati.

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