Dictionary Definition
pentamerous adj : divided into five parts;
specifically, having each floral whorl consist of five (or a
multiple of five) members; "pentamerous flowers"
User Contributed Dictionary
English
Etymology
penta- five; meros partAdjective
pentamerous- in five parts: in a flower each whorl (of flower parts) has five flower parts.
- The Apocynaceae have pentamerous flowers.