One of the mysteries of the English language finally explained.
1Geology. Consisting of more than one grain or more than one mineral.
2Mineralogy. Belonging to, relating to, or designating a series of minerals composed of the same structurally or chemically distinct layers in different ratios or different sequences.
3Genetics. Having both polyploid cells and diploid cells (or in general, cells of different ploidy) in the same somatic tissue; (of a cell or nucleus) belonging to such tissue.
Late 19th century; earliest use found in American Geologist. From poly- + somatic; compare Hellenistic Greek πολυσώματος having many bodies.
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