plural of sick-o

plural of double monocular O

plural of catch-'em-alive-O

(ornithology) A large flightless bird of the genus Struthio. / The most widespread species of the genus, known as the common ostrich (Struthio camelus).

The net movement of solvent molecules, usually water, from a region of lower solute concentration to a region of higher solute concentration through a partially permeable membrane.

A chemical element (symbol Os) with atomic number 76: a hard, brittle, heavy, bluish-white transition metal found as a trace element in alloys, mostly in platinum ores.

A county and municipality, the capital city of Norway. Formerly called Christiania and Kristiania. / A tiny city in Marshall County, in northwest Minnesota, United States.

(modal) Seemingly, apparently, on the surface.

A bird of prey (Pandion haliaetus) that feeds on fish and has white underparts and long, narrow wings each ending in four finger-like extensions. / aigrette (ornamental feather)

A kind of willow, Salix viminalis, growing in wet places in Europe and Asia, and introduced into North America. It is considered the best of the willows for wickerwork (basketweaving with wicker). The name is sometimes given to any kind of willow.