Bergmann's rule

noun Berg·mann's rule \ˈbərg-mənz, ˈberg-\

Definition of Bergmann's rule

  1. :  a statement of the principle that within a polytypic wide-ranging species of warm-blooded animals the average body size of members of each geographic race varies inversely with the mean environmental temperature

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of bergmann's rule

after Karl Bergmann †1865 German biologist

Seen and Heard

What made you want to look up Bergmann's rule? Please tell us where you read or heard it (including the quote, if possible).


capable of being understood in two ways

Get Word of the Day daily email!