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Webster's 1913 Dictionary
PERISOME
Per
"i *
some,
n.
Etym:
[
Pref.
peri-
+ -
some
body.
] (Zoöl.)
Defn:
The
entire
covering
of
an
invertebrate
animal,
as
echinoderm
or
coelenterate;
the
integument.