testacea

noun

1. Any of various shellfish, especially those of the obsolete orders Vermes or Acephala, or the suborder Thecosomata.

   obsolete

   ANAIMONA, Aquatilia Exanguia, Bloodless Fishes, are divided into Mollia Soft Fishes without Shells; Crustata, those that are covered with thin pliant Shells; and Testacea, those which have thick, hard brittle Shells.

Where it comes from

From Latin testāceus (“covered with a shell”).

Adapted from the Wiktionary entry testacea (CC BY-SA 4.0).

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