Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun One member of a given litter of animal offspring.

from the GNU version of the Collaborative International Dictionary of English.

  • noun One of two or more animals born into the same litter.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun An animal born in the same litter

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

litter +‎ mate

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