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Webster's 1913 Dictionary
ARCHIANNELIDA
Ar
`
chi
*
an
*
nel
"i *
da,
n.
pl.
Etym:
[
NL.
;
pref.
archi-
+
annelida.
]
(Zoöl.)
Defn: A
group
of
Annelida
remarkable
for
having
no
external
segments
or
distinct
ventral
nerve
ganglions.