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Webster 1913 Edition
Meconidium
‖
Mecˊo-nid′i-um
,Noun.
[NL., dim. of Gr. [GREEK] a poppy. So called in allusion to the shape of the seed capsules of the poppy.]
(Zool.)
A kind of gonophore produced by hydroids of the genus
Gonothyraea
. It has tentacles, and otherwise resembles a free medusa, but remains attached by a pedicel.