pleon definition

  • noun:
    • In botany, a term proposed by Nägeli for anyone aggregates of particles which can't be increased or diminished in dimensions without switching their substance nature, as distinguished from micellæ, or aggregates which can be therefore increased or diminished. See micella.
    • In Crustacea, the stomach: distinguished from cephalon (head) and pereion (thorax).
    • The tail-spine or telson of some crustaceans, as the king-crab: so-named by Owen, in the supposition so it presents the stomach: correlated with thoracetron and cephaletron.

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