Definition of polysepalous in US English:

polysepalous

adjective

Botany
  • Of a calyx or involucre: having the parts (sepals or bracts) separate, not united. Opposed to gamosepalous, monosepalous.

Origin

Early 19th century. From poly- + sepal + -ous, after French polysépale (N. J. Necker Phytozool. philos 56).