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polytypism

From Wiktionary, the free dictionary

English

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Etymology

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From poly- +‎ type +‎ -ism.

Noun

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polytypism (countable and uncountable, plural polytypisms)

  1. The existence of multiple types, especially of multiple subspecies.
  2. (of crystals) The existence of multiple forms differing in only one of the dimensions of the unit cell.