testacean

[ te-stey-shuhn ]
/ tɛˈsteɪ ʃən /

adjective Zoology.

having a shell or test.

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Origin of testacean

1835–45; <Latin testāce(us) shell-covered, testaceous + -an
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Scientific definitions for testacean

testacean
[ tĕ-stāshən ]

Any of various protozoans of the order Arcellinida (or Testacida) that are encased in a shell. Testaceans are rhizopods and are related to amoebas. Their shell usually has one chamber and may be secreted by the organism as a chitinous or siliceous covering, or may be glued together out of sand particles.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.