SELECT * from dictionary_eng WHERE word = "Allen\'s rule" OR word = "Allen\'s rule" OR word = "Allen\'s Rule" Allen\'s rule | Definition of Allen\'s rule
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Allen's rule

noun

Definition of Allen's rule

: a statement in zoology: protruding body parts (as ears, tail, legs, bill) of warm-blooded animals are relatively shorter in cooler than in warmer parts of the range

First Known Use of Allen's rule

1937, in the meaning defined above

History and Etymology for Allen's rule

after Joel A. Allen

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