OROHELIOGRAPH
Or`o*he"li*o*graph, n. [Gr. mountain + helio- + -graph.] (Photog.)
Defn: A camera for obtaining a circular panoramic view of the horizon. The photographic plate is placed horizontally with a vertical lens above. A mirror of peculiar shape reflects light from the entire horizon to the lens, by means of which it is focused upon the plate.
OROHIPPUS
Or`o*hip"pus, n. Etym: [NL., fr. Gr. (Paleon.)
Defn: A genus of American Eocene mammals allied to the horse, but having four toes in front and three behind.
OROIDE
O"roide, n. Etym: [F. or gold (L. aurum) + Gr.
Defn: An alloy, chiefly of copper and zinc or tin, resembling gold in color and brilliancy. [Written also oreide.]
OROLOGICAL
Or`o*log"ic*al, a. Etym: [Cf. F. orologique.]
Defn: Of or pertaining to orology.
OROLOGIST
O*rol"o*gist, n.
Defn: One versed in orology.