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microevolution the slight hereditary alteration of an organism, as by new combinations of genes, that precedes a small degree of change in a particular form of life.
microfiche a card-sized sheet of microfilm for storage of photographically reduced images, usu. of many pages of text or data.
microfilm a film for recording highly reduced photographic images of material such as text or drawings. [2 definitions]
microfilmable combined form of microfilm.
microform any form or type of photographically reduced document or print, such as microfilm or microfiche.
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]