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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.


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