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1-16 of 16 possibilities

condenser having 2 or 3 lenses with wide aperture for use in microscopes Abbe condenser
gurgling sound of flow from vessel with narrow aperture blodder , glink
darkened enclosure in which images of outside objects are projected through a small aperture or lens onto a facing surface camera obscura
reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror Cassegrainian telescope , Gregorian telescope
mechanical device in a camera that controls size of aperture of the lens diaphragm , stop
act of expanding an aperture dilatation , dilation
aperture of a wind instrument into which the player blows directly embouchure , mouthpiece
reed that does not fit closely over the aperture free-reed
aperture or hole that opens into a bodily cavity opening , orifice , porta
rear gunsight having an adjustable eyepiece with a small aperture through which the front sight and the target are aligned peep sight
compound camera lens with a relatively high aperture portrait lens
contractile aperture in the iris of the eye pupil
any of numerous tropical marine snails that as adults have the outer lip of the aperture produced into a series of long curved spines scorpion shell
arch consisting of a horizontal lintel supported at each end by corbels that project into the aperture shouldered arch
external tracheal aperture in a terrestrial arthropod stigma
sound made by something moving rapidly or by steam coming out of a small aperture whistle , whistling
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