\Nem`a*to*ca"lyx\, n.; pl. {Nematocalyces}, E.
-{calyxes}. [NL. See {Nemato-}, and {Calyx}.] (Zo["o]l.)
One of a peculiar kind of cups, or calicles, found upon
hydroids of the family {Plumularid[ae]}. They contain
nematocysts. See {Plumularia}.