• (botany, zoology) Deviating from the ordinary or natural type; exceptional; abnormal. [First attested in the mid 19th century.]
  • (sometimes figuratively) Straying from the right way; deviating from morality or truth. [First attested in the mid 18th century.]
  • Differing from the norm. [Attesting from the mid 16th century until the early 17th century.]


  • (biology) A group, individual, or structure that deviates from the usual or natural type, especially with an atypical chromosome number.
  • A person or object that deviates from the rest of a group.

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