Or`tho*drom"ic (?), a. [Ortho- + Gr. &?; to run.] Of or pertaining to
orthodromy.
Or`tho*drom"ics (?), n. The art of sailing in a direct course, or on
the arc of a great circle, which is the shortest distance between any
two points on the surface of the globe; great-circle sailing;
orthodromy.
Or"tho*drom`y (?), n. [Cf. F. orthodromie.] The act or art of sailing
on a great circle.
{ Or`tho*ëp"ic (?), Or`tho*ëp"ic*al (?), } a. Of or pertaining to
orthoëpy, or correct pronunciation. -- Or`tho*ëp"ic*al*ly, adv.
Or"tho*ë*pist (?), n. One who is skilled in orthoëpy.
Or"tho*ë*py (?), n. [Gr. &?;; 'orqo`s right + &?; a word: cf. F.
orthoépie. See Ortho-, and Epic.] The art of uttering words correctly;
a correct pronunciation of words; also, mode of pronunciation.
Or*thog"a*my (?), n. [Ortho- + Gr. &?; marriage.] (Bot.) Direct
fertilization in plants, as when the pollen fertilizing the ovules
comes from the stamens of the same blossom; -- opposed to heterogamy.
Or`thog*nath"ic (?), a. Orthognathous.
Or*thog"na*thism (?), n. (Anat.) The quality or state of being
orthognathous. Huxley.
Or*thog"na*thous (?), a. [Ortho- + Gr. &?; the jaw.] (Anat.) Having the
front of the head, or the skull, nearly perpendicular, not retreating
backwards above the jaws; -- opposed to prognathous. See Gnathic index,
under Gnathic.
Or"tho*gon (?), n. [Ortho- + Gr. &?; angle: cf. F. orthogone, a.]
(Geom.) A rectangular figure.
Or*thog"o*nal (?), a. [Cf. F. orthogonal.] Right-angled; rectangular;
as, an orthogonal intersection of one curve with another.
Orthogonal projection. See under Orthographic.
Or*thog"o*nal*ly, adv. Perpendicularly; at right angles; as, a curve
cuts a set of curves orthogonally.
Or*thog"ra*pher (?), n. One versed in orthography; one who spells words
correctly.
{ Or`tho*graph"ic (?), Or`tho*graph"ic*al (?), } a. [Cf. F.
orthographique, L. orthographus, Gr. &?;.]
1. Of or pertaining to orthography, or right spelling; also, correct in
spelling; as, orthographical rules; the letter was orthographic.