Nematocalyx \Nem`a*to*ca"lyx\, n.; pl. {Nematocalyces}, E.
{Nematocalyxes}. [NL. See {Nemato-}, and {Calyx}.] (Zool.)
One of a peculiar kind of cups, or calicles, found upon
hydroids of the family {Plumularidae}. They contain
nematocysts. See {Plumularia}.
[1913 Webster]