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which includes the bivalve shells, like the clams and oysters; -- so called because they have no evident head. Formerly the group included the Tunicata, Brachiopoda, and sometimes the Bryozoa. See Mollusca.

A fabulous people reported by ancient writers to have heads.

To suffer pain; to have, or be in, pain, or in continued pain; to be distressed. "My old bones ache." Shak. The sins that in your conscience ache. Keble.

Achromatic lens (Opt.), a lens composed usually of two separate lenses, a convex and concave, of substances having different refractive and dispersive powers, as crown and flint glass, with the curvatures so adjusted that the chromatic aberration produced by the one is corrected by other, and light emerges from the co…

Needle-shaped; slender like a needle or bristle, as some leaves or crystals; also, having sharp points like needless. A*cic"u*lar*ly, adv.

Having no seed lobes, as the dodder; also applied to plants which have no true seeds, as ferns, mosses, etc.

ars of an act. Acquaint her here of my son Paris' love. Shak. I must acquaint you that I have received New dated letters from Northumberland. Shak.

e gained by intercourse short of that of friendship or intimacy; as, I know the man; but have no acquaintance with him. Contract no friendship, or even acquaintance, with a guileful man. Sir W. Jones.

g 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 of court (anciently, in the country), and not a matter of record.

A large division of Anthozoa, including those which have simple tentacles and do not form stony corals. Sometimes, in a wider sense, applied to all the Anthozoa, expert the Alcyonaria, whether forming corals or not.

operation; as, the action of heat; a man of action. One wise in council, one in action brave. Pope.

A theatrical performer; a stageplayer. After a well graced actor leaves the stage. Shak.

Tapering to a point; pointed; as, acuminate leaves, teeth, etc.

High, or shrill, in respect to some other sound; -- opposed to grave or low; as, an acute tone or accent.

Having sharp-pointed leaves.

Having acute lobes, as some leaves.

ca and India, and A. Gregorii, the sour gourd or cream-of-tartar tree of Australia. Both have a trunk of moderate height, but of enormous diameter, and a wide-spreading head. The fruit is oblong, and filled with pleasantly acid pulp. The wood is very soft, and the bark is used by the natives for making ropes and cloth.…

Applied to sexual zooids of hydroids, that have a saclike form and do not become free; -- opposed to phanerocodonic.

Having glands on the leaves.

To stick fast or cleave, as a glutinous substance does; to become joined or united; as, wax to the finger; the lungs sometimes adhere to the pleura.