OS
Os, n.; pl. Osar. Etym: [Sw. ås ridge, chain of hills, pl. åsar.]
(Geol.)
Defn: One of the ridges of sand or gravel found in Sweden, etc., supposed by some to be of marine origin, but probably formed by subglacial waters. The osar are similar to the kames of Scotland and the eschars of Ireland. See Eschar.
OSAGE ORANGE
O"sage or"ange. (Bot.)
Defn: An ornamental tree of the genus Maclura (M. aurantiaca), closely allied to the mulberry (Morus); also, its fruit. The tree was first found in the country of the Osage Indians, and bears a hard and inedible fruit of an orangelike appearance. See Bois d'arc.
OSAGES
O*sa"ges, n. pl.; sing. Osage (. (Ethnol.)
Defn: A tribe of southern Sioux Indians, now living in the Indian
Territory.
OSANNE
O*san"ne, n.
Defn: Hosanna. [Obs.] Chaucer.
OSAR
O"sar, n. pl. (Geol.)
Defn: See 3d Os.