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accelerometer an instrument that measures acceleration.
accordion a portable musical instrument having a keyboard and a pleated bellows that forces air through metal reeds to produce tones. [1/2 definitions]
acoustic producing sound without electronic or electric means, as a musical instrument. [1/3 definitions]
aeolian harp a musical instrument consisting of an open box with gut strings stretched across it that produce rising and falling sounds when wind passes over them.
alto a musical instrument having the second highest tonal range in its family of instruments. [2/5 definitions]
ammeter an instrument that measures the magnitude of an electrical current in amperes.
anemograph an instrument used to measure and record the speed of the wind.
anemometer an instrument that measures the speed and force of the wind.
anvil the fixed jaw in a measuring instrument such as calipers. [1/3 definitions]
aperture an opening, often adjustable, that controls the amount of light reaching the lens on a camera or other optical instrument. [1/2 definitions]
armillary sphere an ancient sighting instrument formed of rings that are arranged in the positions of the tropics, equator, and the like.
arthroscope an instrument in the shape of a fine tube that is used, in conjunction with fiber optics, for diagnosing and treating ailments of the joint.
astrolabe an instrument used by the ancient Greeks and medieval Arabs to determine the position of heavenly bodies, later replaced by the sextant.
audiometer an instrument that measures range and degree of hearing ability.
auscultation listening to the heart, lungs, or the like for the purpose of medical diagnosis, usu. with a stethoscope or other instrument.
automatic pilot an instrument that automatically keeps an aircraft, missile, or the like on a predetermined course at a specific altitude. [1/2 definitions]
ax (slang) a musical instrument, such as a guitar. [1/4 definitions]
bagpipe a musical instrument, played esp. in Scotland, consisting of a double-reed melody pipe and one or more drone pipes that protrude from a flexible leather bag that is inflated through a blowpipe by the breath or by bellows.
balalaika a guitarlike musical instrument that has a triangular body and usu. three strings.
banjo a musical instrument with a circular body covered with skin, a long fretted neck, and four or five strings that are plucked or strummed.
baritone a large, deep-toned, valved brass wind instrument, used esp. in military or marching bands. [1/4 definitions]