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A genus of Branchiopoda, having a disklike shell, attached by one valve, which is perforated by the peduncle.

A genus of parasitic, trematode worms, having two suckers for attaching themselves to the part they infest. See 1st Fluke,

Any bird of certain genera, as Urinator (formerly Colymbus), or the allied genus Colymbus, or Podiceps, remarkable for their agility in diving.

To separate into species; -- said of a genus or generic term.

The separation of a genus into its constituent species.

A genus of plants (Rumex), some species of which are well-known weeds which have a long taproot and are difficult of extermination.

-- Doctor's stuff, physic, medicine. G. Eliot. -- Doctor fish (Zoöl.), any fish of the genus Acanthurus; the surgeon fish; -- so called from a sharp lancetlike spine on each side of the tail. Also called barber fish. See Surgeon fish.

A plant of the genus Cuscuta. It is a leafless parasitical vine with yellowish threadlike stems. It attaches itself to some other plant, as to flax, goldenrod, etc., and decaying at the root. is nourished by the plant that supports it.

A quadruped of the genus Canis, esp. the domestic dog (C. familiaris).

A small genus of perennial herbaceous plants, with poisonous milky juice, bearing slender pods pods in pairs.

Having a face resembling that of a dog. Dog-faced baboon (Zoöl.), any baboon of the genus Cynocephalus. See Drill.

The Arctic or blue fox; -- a name also applied to species of the genus Cynalopex.

a dog. See Calcite. -- Dogtooth violet (Bot.), a small, bulbous herb of the Lily family (genus Erythronium). It has two shining flat leaves and commonly one large flower. [Written also dog's-tooth violet.]

The Cornus, a genus of large shrubs or small trees, the wood of which is exceedingly hard, and serviceable for many purposes.

A genus of freeswimming oceanic tunicates, allied to Salpa, and having alternate generations.

A genus of large univalve mollusks, including the partridge shell and tun shells.

A cetacean of the genus Delphinus and allied genera (esp. D. delphis); the true dolphin.

A large, oceanic fish of the genus Coryphæna.

A genus of nudibranchiate mollusks having a wreath of branchiæ on the back.

A small European rodent of the genus Myoxus, of several species. They live in trees and feed on nuts, acorns, etc.; -- so called because they are usually torpid in winter.