Cnidaria :: Cnidaria (n. pl.) A comprehensive group equivalent to the true Coelenterata, i. e., exclusive of the sponges. They are so named from presence of stinging cells (cnidae) in the tissues. See Coelenterata..
Nidamental :: Nidamental (a.) Of, pertaining to, or baring, eggs or egg capsules; as, the nidament capsules of certain gastropods; nidamental glands. See Illust. of Dibranchiata..
Pycnogonida :: Pycnogonida (n. pl.) A class of marine arthropods in which the body is small and thin, and the eight legs usually very long; -- called also Pantopoda..