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Any species of a tribe (Naiades) of freshwater bivalves, including Unio, Anodonta, and numerous allied genera; a river mussel.

An arctic cetacean (Monodon monocerous), about twenty feet long. The male usually has one long, twisted, pointed canine tooth, or tusk projecting forward from the upper jaw like a horn, whence it is called also sea unicorn, unicorn fish, and unicorn whale. Sometimes two horns are developed, side by side.…

The head; the noddle. [Obs.]

Nodding; having the top bent downward.

The act of nodding. So from the midmost the nutation spreads, Round and more round, o'er all the sea of heads. Pope.

wel sounds, the principal of which are its long sound, as in bone, its short sound, as in nod, and the sounds heard in the words orb, son, do (feod), and wolf (book). In connection with the other vowels it forms several digraphs and diphthongs. See Guide to Pronunciation, §§ 107-129.

A class of star-shaped echinoderms having a disklike body, with slender, articulated arms, which are not grooved beneath and are often very fragile; -- called also Ophiuroida and Ophiuridea. See Illust. under Brittle star.

Inducing sleep; somniferous; narcotic; hence, anodyne; causing rest, dullness, or inaction; as, the opiate rod of Hermes. Milton.

st each other, but separated by the whole diameter of the stem, as two leaves at the same node.

Placed at the same node with a leaf, but separated from it by the whole diameter of the stem; as, an oppositifolious peduncle.

n some genera had only three functional toes, and supported the body in walking as in Iguanodon. See Illust. in Appendix.

One of numerous small calcareous structures forming the skeleton of certain echinoderms, as the starfishes.

A valuable pasture grass (Panicum barbinode) introduced into the Southern United States from Brazil.

A medicine that mitigates pain; an anodyne; specifically, camphorated tincture of opium; -- called also paregoric elexir.

The region surrounding the anus, particularly of echinoderms.

The entire covering of an invertebrate animal, as echinoderm or coelenterate; the integument.

ily Procellaridæ. The small petrels, or Mother Carey's chickens, belong to Oceanites, Oceanodroma, Procellaria, and several allied genera. Diving petrel, any bird of the genus Pelecanoides. They chiefly inhabit the southern hemisphere. -- Fulmar petrel, Giant petrel. See Fulmar. -- Pintado petrel, the Cape pigeon. Se…

Pathches of lymphoid nodules, in the walls of the small intestiness; agminated glands; -- called also Peyer's patches. In typhoid fever they become the seat of ulcers which are regarded as the characteristic organic lesion of that disease.

ne of the digital bones of the hand or foot, beyond the metacarpus or metatarsus; an internode.

Pertaining to, or containing, phosphorus, phosphoric acid, or phosphates; as, phosphatic nodules. Phosphatic diathesis (Med.), a habit of body which leads to the undue excretion of phosphates with the urine.