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Having the parts arranged in sets of four; as, a tetramerous flower.

Having the parts in threes.

t of grace, an expression often used to designate an act declaring pardon or amnesty to numerous offenders, as at the beginning of a new reign. -- Act of indemnity, a statute passed for the protection of those who have committed some illegal act subjecting them to penalties. Abbott. -- Act in pais, a thing done out o…

Any of numerous neuropterous insects of the genus Sialis or allied genera. They have aquatic larvæ, which are used for bait.

A name numerous species of South American parrots of the genus Chrysotis Amazon ant (Zoöl.), a species of ant (Polyergus rufescens), of Europe and America. They seize by conquest the larvæ and nymphs other species and make slaves of them in their own nests.

, the typical forms having existed only in the Mesozoic age, when they were exceedingly numerous. They differ from the nautili in having the margins of the septa very much lobed or plaited, and the siphuncle dorsal. Also called serpent stone, snake stone, and cornu Ammonis.

A numerous group of fourteen -- footed Crustacea, inhabiting both fresh and salt water. The body is usually compressed laterally, and the anterior pairs or legs are directed downward and forward, but the posterior legs are usually turned upward and backward. The beach flea is an example. See Tetradecapoda and Arthrostr…

A prefix, or combining form, in numerous compounds, usually relating to seed or blood vessels, or to something contained in, or covered by, a vessel.

A division of the Articulata, having the body formed of numerous rings or annular segments, and without jointed legs. The principal subdivisions are the Chætopoda, including the Oligochæta or earthworms and Polychæta or marine worms; and the Hirudinea or leeches. See Chætopoda.

A genus of insects belonging to the order Hemiptera and family Aphidæ, including numerous species known as plant lice and green flies.

One of a swarthy race occupying Arabia, and numerous in Syria, Northern Africa, etc. Street Arab, a homeless vagabond in the streets of a city, particularly and outcast boy or girl. Tylor. The ragged outcasts and street Arabs who are shivering in damp doorways. Lond. Sat. Rev.

at.), a form of fibrous connective tissue in which the fibers are loosely arranged with numerous spaces, or areolæ, between them.

to the three great arms of infantry, cavalry, and artillery, together with more or less numerous other branches, such as engineers, medical corps, etc., besides the staff organizations such as those of the pay and subsistence departments.

ted, and prickly involucre. The head (to which the name is also applied) is composed of numerous oval scales, inclosing the florets, sitting on a broad receptacle, which, with the fleshy base of the scales, is much esteemed as an article of food.

A starlike body; esp. one of the numerous small planets whose orbits lie between those of Mars and Jupiter; -- called also planetoids and minor planets.

A genus of papilionaceous plants, of the tribe Galegeæ, containing numerous species, two of which are called, in English, milk vetch and licorice vetch. Gum tragacanth is obtained from different oriental species, particularly the A. gummifer and A. verus.

Mississippi; -- a nickname, from its numerous bayous.

.), a wingless insect of the group Mallophaga, of which the genera and species are very numerous and mostly parasitic upon birds. -- Bird mite (Zoöl.), a small mite (genera Dermanyssus, Dermaleichus and allies) parasitic upon birds. The species are numerous. -- Bird of passage, a migratory bird. -- Bird spider (Zoöl…

A genus (Utricularia) of aquatic or marshy plants, which usually bear numerous vesicles in the divisions of the leaves. These serve as traps for minute animals. See Ascidium.

s Blennius or family Blenniidæ; -- so called from its coating of mucus. The species are numerous.