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In botany, a term proposed by Nägeli for those aggregates of molecules which cannot be increased or diminished in size without changing their chemical nature, as distinguished from micellæ, or aggregates that can be so increased or diminished. See micella.
(noun)
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In Crustacea, the abdomen: distinguished from cephalon (head) and pereion (thorax).
(noun)
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The tail-spine or telson of some crustaceans, as the king-crab: so named by Owen, on the supposition that it represents the abdomen: correlated with thoracetron and cephaletron.
(noun)
The Century Dictionary (Public Domain)