Caenogenesis

noun

Definitions

Noun
  1. 1
    The embryotic development of structures or characteristics not present in the species before. countable, uncountable
  2. 2
    introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (such as the addition of the placenta in mammalian evolution) wordnet

Etymology

From Ancient Greek καινός (kainós, “new”) + -genesis.

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