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microgram a unit of weight equal to one millionth of a gram. [2 definitions]
micrograph a drawing or photograph of something as it is seen through a microscope. [2 definitions]
microgroove an especially fine groove on a long-playing record, or a record having such a groove.
micrometer1 an instrument for measuring minute distances, angles, diameters, and the like in telescopic and microscopic images. [2 definitions]
micrometer2 see micron.
micrometer caliper a precision caliper with a spindle that is moved by a micrometer screw, used for measuring minute distances with extreme accuracy.
micrometer screw a very finely threaded screw that is used in micrometers to give extremely fine measurements, esp. of thickness.
micrometry measuring with micrometers.
micron a unit of length equal to one millionth of a meter.
Micronesia one of the three principal Pacific island groups, north of the equator, between the Philippines and the international date line. (Cf. Melanesia, Polynesia.) [2 definitions]
Micronesian of or pertaining to Micronesia or its people, cultures, languages, or the like. [3 definitions]
micronucleus the smaller of two kinds of nuclei that are found in certain protozoans and that are associated with genetics and reproduction.
micronutrient an element that, in extremely small amounts, is necessary for the health of an organism.
microorganism any microscopic life form such as a bacterium, protozoan, or virus.
microphone a device that converts sound waves into electronic signals for recording, amplification, or broadcast.
microphotograph a very small photograph that must be enlarged to be seen in detail. [3 definitions]
microprint the printed or positive reproduction of a microphotograph to be viewed or read by means of a magnifying device, such as a projector.
microprocessor the integrated circuit of a microcomputer, usu. contained on a single silicon chip.
micropublishing the publication of items, such as documents or newspapers, that have been photographically reduced.
microscope an instrument using a lens or lenses to magnify extremely small objects, esp. those not visible to the unaided eye.
microscopic too small to be seen with the unaided eye. [3 definitions]