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Insects without wings, constituting the seventh Linnæn order of insects, an artificial group, which included Crustacea, spiders, centipeds, and even worms. These animals are now placed in several distinct classes and orders.

Apterous.

One of the Aptera.

See Dermoptera, Dermopteran.

An insect having four wings.

Destitute of wings; apteral; as, apterous insects.

An order of Mammalia; the Cheiroptera. [Written also Dermaptera, and Dermatoptera.]

Any whale of the genus Megaptera, characterized by a hump or bunch on the back. Several species are known. The most common ones in the North Atlantic are Megaptera longimana of Europe, and M. osphyia of America; that of the California coasts is M. versabilis.

s (Moringa pterygosperma) is the horse-radish tree, and its seeds, as well as those of M. aptera, are known in commerce as ben or ben nuts, and yield the oil called oil of ben.

Having columns on all sides; -- said of an edifice. See Apteral.

age, so-called. -- Silver-bell tree (Bot.), an American shrub or small tree (Halesia tetraptera) with white bell-shaped flowers in clusters or racemes; the snowdrop tree. -- Silver bush (Bot.), a shrubby leguminous plant (Anthyllis Barba- Jovis) of Southern Europe, having silvery foliage. -- Silver chub (Zoöl.), the…