'Pygidium' definitions:
Definition of '
Pygidium
'
From:
GCIDE
Pygidium \Py*gid"i*um\, n.; pl.
Pygidia
. [NL., fr. Gr. ?, dim. of ? the rump.] (Zool.) The caudal plate of trilobites, crustacean, and certain insects. See Illust. of
Limulus
and
Trilobite
. [1913 Webster] Pygmy
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