testacean adjective & noun. [tɛ'steɪʃ(ǝ)n] M19.
[formed as TESTACEOUS + -AN.]
Zoology.
A. adjective. Of an invertebrate animal (now esp. an amoeboid protozoan): having a shell. M19.
b. noun. Orig., a shellfish, a mollusc. Now, any testacean animal, esp. a shelled amoeba. M19.

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