Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of achenium is as below...

Pentachenium :: Pentachenium (n.) A dry fruit composed of five carpels, which are covered by an epigynous calyx and separate at maturity..

Spermidium :: Spermidium (n.) An achenium.

Achenium :: Achenium (n.) A small, dry, indehiscent fruit, containing a single seed, as in the buttercup; -- called a naked seed by the earlier botanists..

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