(mineralogy) A uranium oxide mineral of variable composition and uncertain structure, its colour varying from dark brown to orange.

Of or pertaining to Samuel Clarke (1675-1729), English philosopher. / Of or pertaining to Arthur C Clarke (1917-2008), British science fiction writer and futurist.

Any of several annual flowering plants, of the genus Clarkia, native to the Americas.

A nickname of the surname Clarke.

plural of clarkia

A surname originating as an occupation or as a patronymic for a son of a scribe or priest. / A northern suburb of Perth, in the City of Wanneroo, Western Australia.

(informal) A student at, or alum of, Clark University.

plural of Clarkie

A ghost town in Clarke County, Alabama. / A city, the county seat of Habersham County, Georgia. / (obsolete) Sciota, Illinois.

A city, the county seat of Montgomery County, Tennessee; named for George Rodgers Clark. / A town in Clark County, Indiana; named for explorer William Clark.