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A pentamer is a thing composed out of five sub-units. In chemistry, it applies to molecules made of five Pentamery (botany), a characteristic of plants having five petals (pentamerous flowers). — “Pentamer - Wikipedia, the free encyclopedia”, en.wikipedia.org
It is most commonly used in the context of flowers, in which case it refers to the number of sepals in the calyx, the number of 5: pentamery, pentamerous, 5-merous. Tulipa clusiana: trimerous. Correa. — “Merosity - Wikipedia, the free encyclopedia”, en.wikipedia.org