Defn: A large and bright constellation on the equator, between the
stars Aldebaran and Sirius. It contains a remarkable nebula visible
to the naked eye.
The flaming glories of Orion's belt. E. Everett.

ORISKANY
O*ris"ka*ny, a. Etym: [From Oriskany, in New York.] (Geol.)

Defn: Designating, or pertaining to, certain beds, chiefly limestone, characteristic of the latest period of the Silurian age. Oriskany period, a subdivision of the American Paleozoic system intermediate or translational in character between the Silurian and Devonian ages. See Chart of Geology.

ORISMOLOGICAL
O*ris`mo*log"ic*al, a. (Nat. Hist.)

Defn: Of or pertaining to orismology.

ORISMOLOGY
O`ris*mol"o*gy, n. Etym: [Gr. -logy. See Horizon.]

Defn: That departament of natural history which treats of technical terms.

ORISON Or"i*son, n. Etym: [OF. orison, oreson, oreison, F. oraison, fr. L. oratio speech, prayer. See Oration.]

Defn: A prayer; a supplication. [Poetic] Chaucer. Shak. Lowly they bowed, adoring, and began Their orisons, each morning duly paid. Milton.

ORISONT
Or"i*sont, n.