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One of the artificial group of invertebrates of various kinds, which live parasitically upon the exterior of other animals; an ectozoön. Among them are the lice, ticks, many acari, the lerneans, or fish lice, and other crustaceans.

A group of chætopod annelids, including those that are not confined to tubes. See Chætopoda. [Written also Errantes.]

A group which includes the typical copepods and the lerneans.

A group which includes the bony ganoids, as the gar pikes.

A group which includes the typical Isopoda.

A metallic element of the rare-earth group, discovered spectroscopically by Demarcay in 1896. Symbol, Eu; at. wt., 152.0.

The general aspect or habit of a species, or group of species, esp. with reference to its adaptation to its environment.

Groups of small shining spots on the surface of the sun which are brighter than the other parts of the photosphere. They are generally seen in the neighborhood of the dark spots, and are supposed to be elevated portions of the photosphere. Newcomb.

One of a group of Australian birds of the genus Falcunculus, resembling shrikes and titmice.

, or misshapen fleshy mass, is produced instead of a properly organized fetus. -- False croup (Med.), a spasmodic affection of the larynx attended with the symptoms of membranous croup, but unassociated with the deposit of a fibrinous membrane. -- False door or window (Arch.), the representation of a door or window,…

The group comprising a husband and wife and their dependent children, constituting a fundamental unit in the organization of society. The welfare of the family underlies the welfare of society. H. Spencer.

Grouped in a fascicle; fascicled.

ns and their derivatives; the marsh gas or methane series. -- Natural fats (Chem.), the group of oily substances of natural occurrence, as butter, lard, tallow, etc., as distinguished from certain fatlike substance of artificial production, as paraffin. Most natural fats are essentially mixtures of triglycerides of fa…

A group of spores arranged without order and covered with a thin gelatinous envelope, as in certain delicate red algæ.

A black, greenish, or brownish mineral of the chrysolite group. It is a silicate of iron.

A name given to a group of minerals, closely related in crystalline form, and all silicates of alumina with either potash, soda, lime, or, in one case, baryta. They occur in crystals and crystalline masses, vitreous in luster, and breaking rather easily in two directions at right angles to each other, or nearly so. The…

A group of mammals which formerly included the Carnivora, Insectivora, Marsupialia, and lemurs, but is now often restricted to the Carnivora.

nation is in a ferment. Walpole. in a ferment in a state of agitation, applied to human groups.

One who dances at the opera, not singly, but in groups or figures; an accessory character on the stage, who figures in its scenes, but has nothing to say; hence, one who figures in any scene, without taking a prominent part.

Any short succession of notes, either as melody or as a group of chords, which produce a single complete and distinct impression. Grove.