A carnival sideshow featuring only one performer or attraction.

A young woman of low social status (often enslaved) who performs as a musician and entertainer, especially in Asian societies.

(mathematics) Synonym of singleton (“a set containing exactly one element”)

Synonym of since Adam was an oakum boy

(archaic, slang) Since an extremely long time ago; since long before living memory.

(Canada, US, colloquial) Since a very long time ago.

(anatomy) A small but richly innervated arterial enlargement that is located near the point in the neck where either carotid artery divides to form its main branches and that functions in the regulation of heart rate and blood pressure.

(anatomy) Either of a pair of large venous sinuses situated in a groove at the side of the body of the sphenoid bone in the cranial cavity and opening behind into the petrosal sinuses.

plural of sinus venosus

(zootomy) The first chamber of the heart in fish, amphibians, and reptiles, emptying into the right atrium.