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Webster's 1913 Dictionary
PLANORBIS
Pla
*
nor
"
bis,
n.
Etym:
[
NL.
,
fr.
L. planus
flat
+
orbis
a
circle.
]
(Zoöl.)
Defn:
Any
fresh-water
air-breathing
mollusk
belonging
to
Planorbis
and
other
allied
genera,
having
shells
of
a
discoidal
form.