protegulum
noun
pro·tegulum
\(ˈ)prō+\
Definition of protegulum
-s
: the embryonic shell of a brachiopod that is biconvex and smooth and has a wide posterior gape
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Origin and Etymology of protegulum
New Latin, from 1pro- + Latin tegulum covering, from tegere to cover + -ulum (neuter of -ulus -ule) — more at thatch
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