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Collimator :: Collimator (n.) A tube having a convex lens at one end and at the other a small opening or slit which is at the principal focus of the lens, used for producing a beam of parallel rays; also, a lens so used..

Machicolation :: Machicolation (n.) An opening between the corbels which support a projecting parapet, or in the floor of a gallery or the roof of a portal, shooting or dropping missiles upen assailants attacking the base of the walls. Also, the construction of such defenses, in general, when of this character. See Illusts. of Battlement and Castle..

Release :: Release (n.) The act of opening the exhaust port to allow the steam to escape.

Sinus :: Sinus (n.) An opening; a hollow; a bending.

Twinkle :: Twinkle (n.) A closing or opening, or a quick motion, of the eye; a wink or sparkle of the eye..

Collar :: Collar (n.) A ring or round flange upon, surrounding, or against an object, and used for restraining motion within given limits, or for holding something to its place, or for hiding an opening around an object; as, a collar on a shaft, used to prevent endwise motion of the shaft; a collar surrounding a stovepipe at the place where it enters a wall. The flanges of a piston and the gland of a stuffing box are sometimes called collars..

Debouchure :: Debouchure (n.) The outward opening of a river, of a valley, or of a strait..

Overture :: Overture () An opening or aperture; a recess; a recess; a chamber.

Lid :: Lid (n.) That which covers the opening of a vessel or box, etc.; a movable cover; as, the lid of a chest or trunk..

Label :: Label (n.) The name now generally given to the projecting molding by the sides, and over the tops, of openings in mediaeval architecture. It always has a /quare form, as in the illustration..

Coamings :: Coamings (n. pl.) Raised pieces of wood of iron around a hatchway, skylight, or other opening in the deck, to prevent water from running bellow; esp. the fore-and-aft pieces of a hatchway frame as distinguished from the transverse head ledges..

Sac :: Sac (n.) A cavity, bag, or receptacle, usually containing fluid, and either closed, or opening into another cavity to the exterior; a sack..

Os :: Os (n.) A mouth; an opening; an entrance.

Display :: Display (n.) An opening or unfolding; exhibition; manifestation.

Laxative :: Laxative (a.) Having the effect of loosening or opening the intestines, and relieving from constipation; -- opposed to astringent..

Fatiscence :: Fatiscence (n.) A gaping or opening; state of being chinky, or having apertures..

Alcove :: Alcove (n.) A recessed portion of a room, or a small room opening into a larger one; especially, a recess to contain a bed; a lateral recess in a library..

Fissure :: Fissure (n.) A narrow opening, made by the parting of any substance; a cleft; as, the fissure of a rock..

Tympanum :: Tympanum (n.) The space within an arch, and above a lintel or a subordinate arch, spanning the opening below the arch..

Challenge :: Challenge (n.) The opening and crying of hounds at first finding the scent of their game.

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