Definition of "outcross"

outcross

noun
plural outcrosses
1. The introduction of unrelated breeding stock to an existing population, especially one which is inbred or homogeneous.
  Quotations
  Their two sons, Joseph I and Charles VI went still further in their pursuit of an out-cross by both marrying princesses from the Guelph house of Brunswick.
  2007, Tim Blanning, The Pursuit of Glory, Penguin, published 2008, page 249
2. A plant or animal produced by such methods.
verb
third-person singular simple present outcrosses, present participle outcrossing, simple past and past participle outcrossed
1. (transitive) to crossbreed different strains of a plant or animal.