[pen.tam.er.ous] adj [NL pentamerus, fr. penta- (fr. Gk) + -merus -merous] (1826): divided into or consisting of five parts; specif: having each floral whorl consisting of five or a multiple of five members
PENTAMEROUS
Meaning of PENTAMEROUS in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012