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A hole made by boring or piercing; an aperture. "Slender perforations." Sir T. Browne.

The state of being without perforation.

Absence or closure of a natural passage or channel of the body; imperforation.

Having two perforations.

To make a hole or perforation with, or as with, a boring instrument; to cut a circular hole by the rotary motion of a tool; as, to bore for water or oil (i. e., to sink a well by boring for water or oil); to bore with a gimlet; to bore into a tree (as insects).

A small hole or perforation to receive a cord or fastener, as in garments, sails, etc.

A small opening, perforation, or orifice; a fenestra. Foramen of Monro (Anat.), the opening from each lateral into the third ventricle of the brain. -- Foramen of Winslow (Anat.), the opening connecting the sac of the omentum with the general cavity of the peritoneum.

ee under Pendulum. -- Gridiron valve (Steam Engine), a slide valve with several parallel perforations corresponding to openings in the seat on which the valve moves.

or cavity; an excavation; a pit; an opening in or through a solid body, a fabric, etc.; a perforation; a rent; a fissure. The holes where eyes should be. Shak. The blind walls Were full of chinks and holes. Tennyson. The priest took a chest, and bored a hole in the lid. 2 Kings xii. 9.

A piece of wood, shell, stone, or other substance, worn in a perforation of the lip or cheek by many savages.

In any surface prepared with indentations, perforations, or grooves, that part of the surface which is not so treated, as the level part of a millstone between the furrows, or the surface of the bore of a rifled gun between the grooves. Land agent, a person employed to sell or let land, to collect rents, and to attend…

The transient approximation of the edges of a natural opening; imperforation. Dunglison. Occlusion of gases (Chem. & Physics), the phenomenon of absorbing gases, as exhibited by platinum, palladium, iron, or charcoal; thus, palladium absorbs, or occludes, nearly a thousand times its own volume of hydrogen, and in this…

The perforation of a cavity of the body with a trocar, aspirator, or other suitable instrument, for the evacuation of effused fluid, pus, or gas; tapping.

A punched hole; a perforation. Bacon.

ee Alfilaria. -- Pin hole, a small hole made by a pin; hence, any very small aperture or perforation. -- Pin lock, a lock having a cylindrical bolt; a lock in which pins, arranged by the key, are used instead of tumblers. -- Pin money, an allowance of money, as that made by a husband to his wife, for private and per…

Ornamented with perforations or dots. [Obs.] "Gilt bowls pounced and pierced." Holinshed.

Decorative perforation of cloth. [Obs.]

A cylinder, or a cylindrical perforation, having a continuous rib, called the thread, winding round it spirally at a constant inclination, so as to leave a continuous spiral groove, between one turn and the next, -- used chiefly for producing, when revolved, motion or pressure in the direction of its axis, by the slidi…

A narrow depression, perforation, or aperture; esp., one for the reception of a piece fitting or sliding in it.