meaning of pentamerous
1. Divided into, or consisting of, five parts; also, arranged in sets, with five parts in each set, as a flower with five sepals, five petals, five, or twice five, stamens, and five pistils.
2. Belonging to the Pentamera.
3. divided into five parts; specifically, having each floral whorl consist of five or a multiple of five members; "pentamerous
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