- consisting of five parts, esp (of flowers) having the petals, sepals, and other parts arranged in groups of five
WordReference Random House Unabridged Dictionary of American English © 2026
pen•tam•er•ous
(pen tam′ər əs),USA pronunciation adj.
pen•tam′er•ism, pen•tam′er•y, n.
- consisting of or divided into five parts.
- Botany(of flowers) having five members in each whorl.
- Neo-Latin pentamerus. See penta-, -merous
- 1820–30
Collins Concise English Dictionary © HarperCollins Publishers::
pentamerous /pɛnˈtæmərəs/ adj