Definition of gamosepalous in US English:

gamosepalous

adjective

  • (Of a calyx) having fused sepals.

Origin

Early 19th century; earliest use found in Samuel Frederick Gray (1766–1828), naturalist and pharmacologist. After French gamosépale (A. P. de Candolle Théorie élémentaire de la botanique (ed. 2) 477; compare also scientific Latin gamosepalus.