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Tetrad
A tetrad is a "group of four". It may refer to: * Tetrad (chromosomal formation) * Tetrad (genetics), the four spores of a yeast * Tetrad (general relativity), a mathematical frame of reference in general relativity * Tetrad (index notation), a concept in differential geometry * Tetrad (music), a set of four notes * Tetrad (symbol) or tetractys * Tetrad (unit of area) * Tetrad, a group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis * Tetrad (astronomy), an occurrence of 4 total lunar eclipses in a row with intervals of 6 lunations (semester). * Tetrad (computing), a 4-bit group == See also ==
* Celsus tetrad, the four cardinal signs of inflammation * Dark tetrad, group of four undesirable personality traits * Tetrad of media effects, a pedagogical tool * Tetromino, a shape composed of four squares
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Tetrad」の詳細全文を読む
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