from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To breed by the continued mating of closely related individuals, especially to preserve desirable traits in a stock.
  • transitive v. To breed or develop within; engender.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To breed or reproduce with those that are related.
  • v. To breed with those that share common traits or qualities.
  • v. To produce or generate within.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To produce or generate within.
  • transitive v. To breed in and in. See under Breed, v. i.

from The Century Dictionary and Cyclopedia

  • To breed, generate, or develop within.
  • To breed from animals of the same parentage or otherwise closely related; breed in-and-in.


From in- +‎ breed. (Wiktionary)



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