Initialism of obstructive sleep apnea. / Initialism of osteosarcoma.

Initialism of Ontario Soccer Association. / Initialism of Ontario Society of Artists. / Initialism of Open Solutions Alliance. / Initialism of Oregon Student Association.

The tree Maclura pomifera, noted for its large, dense, wrinkly, bright green and unpalatable fruit, once a popular hedge tree in the United States. / The fruit of this tree.

(sumo) A kimarite in which the attacker, grappling near the edge, bends backwards and swings his opponent around and out.

(organic chemistry) any glycoside of an aldose or 2-ketose formed by reaction with excess of an aryl-hydrazine

An esker.

plural of osazone

The capital city of Osaka Prefecture, Japan. / A prefecture on the island of Honshu, Japan.

An indigenous North American people. / A member of the Osage tribe.

The language of this people. / A village in Saskatchewan, Canada. / An unincorporated community in Carroll County, Arkansas. / A city, the county seat of Mitchell County, Iowa, United States.