Definition of polyadelphous in US English:

polyadelphous

adjective

Botany
  • Of stamens: partially united by their filaments into three or more groups. Formerly also: †(in the Linnaean artificial system) characteristic of or belonging to the class Polyadelphia (obsolete).

Origin

Late 18th century; earliest use found in John Abercrombie (1726–1806), horticulturist and writer. From polyadelph- + -ous. Compare Hellenistic Greek πολυάδελϕος having many brothers.

Pronunciation

polyadelphous

/ˌpɒlɪəˈdɛlfəs/