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Not avoidable; incapable of being shunned or prevented; inevitable; necessary; as, unavoidable troubles.

To prevent from being a fellow or companion; to separate from one's fellows; to dissever. Death quite unfellows us. Mrs. Browning.

The act, art, or practice of vaccinating, or inoculating with the cowpox, in order to prevent or mitigate an attack of smallpox. Cf. Inoculation.

the ends curved and pointed, used on toe or quarter cracks to bind the edges together and prevent motion. It is clasped into two notches, one on each side of the crack, burned into the wall with a cautery iron.

it air to a vessel in which the pressure is less than that of the atmosphere, in order to prevent collapse. -- Torricellian vacuum. See under Torricellian.

d falling, sliding, turning, or the like, it will open or close the aperture to permit or prevent passage, as of a fluid.

vapor from molten zinc in a separate receptacle, using hydrogen or other reducing gas to prevent oxidation.

Tending to prevent, destroy, or expel, worms or vermin; anthelmintic.

ent; especially, in a constitutional government, a power vested in the chief executive to prevent the enactment of measures passed by the legislature. Such a power may be absolute, as in the case of the Tribunes of the People in ancient Rome, or limited, as in the case of the President of the United States. Called also…

of which the owner is not known; originally, such goods as a pursued thief threw away to prevent being apprehended, which belonged to the king unless the owner made pursuit of the felon, took him, and brought him to justice. Blackstone.

A projecting ridge of metal in the interior of a lock, to prevent the use of any key which has not a corresponding notch for passing it.

, as around a bolt or screw to form a seat for the head or nut, or around a wagon axle to prevent endwise motion of the hub of the wheel and relieve friction, or in a joint to form a packing, etc.

l, vigilant, or constantly observant attention; close observation; guard; preservative or preventive vigilance; formerly, a watching or guarding by night. Shepherds keeping watch by night. Milton. All the long night their mournful watch they keep. Addison.

A gate, or valve, by which a flow of water is permitted, prevented, or regulated.

ewhere, the rest of the surface being sunken or dished. The raised surface is intended to prevent the settling of water in the joints.

Prevented by a flood from proceeding.

upply of water, generally of a cylindrical form, and often walled with stone or bricks to prevent the earth from caving in. The woman said unto him, Sir, thou hast nothing to draw with, and the well is deep. John iv. 11.

prevented from sailing, by a contrary wind. See Weatherbound.

So tight as to prevent the passing through of wind. Bp. Hall.

(Mach.), an iron gudgeon for the end of a wooden axle, having thin, broad projections to prevent it from turning in the wood. See Illust. of Gudgeon. -- Wing shell (Zoöl.), wing case of an insect. -- Wing stroke, the stroke or sweep of a wing. -- Wing transom (Naut.), the uppermost transom of the stern; -- called a…