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ss. (Bot.) See 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 pri…

A group of cells resembling a stoma, but without any true aperture among them.

The aperture in the iris; the sight, apple, or black of the eye. See the Note under Eye, and Iris. Pin-hole pupil (Med.), the pupil of the eye when so contracted (as it sometimes is in typhus, or opium poisoning) as to resemble a pin hole. Dunglison.

y, a vessel in the form of a cylinder open at one end, or a hollow ball of brass with two apertures, so contrived as to greatly intensify a musical tone by its resonance. It is used for the study and analysis of complex sounds.

A narrow and elongated aperture; a cleft; a fissure.

A rent or long aperture; a chink; a fissure; a crack. Sir T. Browne.

To draw through an eye or aperture.

A breaking or bursting open; breach; rupture. "By ruption or apertion." Wiseman.

ike and often bright-colored gills around its head, and usually an operculum to close the aperture of its tube when it retracts.

A removable cover, or a gate, for closing an aperture of any kind, as for closing the passageway for molten iron from a ladle.

A small aperture through which objects are to be seen, and by which their direction is settled or ascertained; as, the sight of a quadrant. Thier eyes of fire sparking through sights of steel. Shak.

Having the front edge of the aperture of the shell prolonged in the shape of a channel for the protection of the siphon; -- said of certain gastropods.

A cover which opens or closes an aperture by sliding over it.

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

Any small aperture or vent for air or other fluid.

One of the apertures of the pulmonary sacs of arachnids. See Illust. of Scorpion.

One of the minute apertures between the cells in many serous membranes.

Of or pertaining to the operation of forming a mouth where the aperture has been contracted, or in any way deformed.

To close, as an aperture, by filling or by obstructing; as, to stop the ears; hence, to stanch, as a wound. Shak.

as, the subnasal point, or the middle point of the inferior border of the anterior nasal aperture.