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[From the Allegheny River, Pennsylvania.] (Geol.) Pertaining to or designating a subdivision of the Pennsylvanian coal measure.

Of or pertaining to Amhara, a division of Abyssinia; as, the Amharic language is closely allied to the Ethiopic. -- n.

Cell division in which there is first a simple cleavage of the nucleus without change in its structure (such as the formation of chromosomes), followed by the division of the cytoplasm; direct cell division; -- opposed to mitosis. It is not the usual mode of division, and is believed by many to occur chiefly in highly…

That division of the Rhizopoda which includes the amoeba and similar forms.

The achromatic figure, formed in mitotic cell-division, consisting of two asters connected by a spindle-shaped bundle of rodlike fibers diverging from each aster, and called the spindle.

A division of insects having aquatic larvæ.

A division of Mollusca remarkable for the bilateral symmetry of the organs and the arrangement of the nerves.

An administrative territorial division in Denmark and Norway.

The division of Vertebrata in which no allantois is developed. It includes amphibians, fishes, and lower forms.

One of the divisions of Articulata in which there are no jointed legs, as the annelids; -- opposed to Arthropoda.

A primary division of gastropods, including those having spiral shells. The two sides of the body are unequally developed.

A division of Crustacea, which, in some its characteristics, is intermediate between Amphipoda and Isopoda.

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 division of the Articulata, including the annelids and allied groups; sometimes made to include also the helminths and echinoderms. [Written also Annuloidea.]

A division of the Invertebrata, nearly equivalent to the Articulata. It includes the Arthoropoda and Anarthropoda. By some zoölogists it is applied to the former only.

A division of birds including the geese, ducks, and closely allied forms.

Where a choir is divided, as in some Spanish churches, that division of it which is the farther from the sanctuary.

A division of nudibranchiate Mollusca, in which the gills form a wreath or cluster upon the posterior part of the back. See Nudibranchiata, and Doris.

f anthropology which treats of the actual distribution of the human race in its different divisions, as distinguished by physical character, language, institutions, and customs, in contradistinction to ethnography, which treats historically of the origin and filiation of races and nations. P. Cyc.

A room in a building; a division in a house, separated from others by partitions. Fielding.