hybridize

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

• intransitive verb To produce hybrids; crossbreed.
• intransitive verb To form base pairs between complementary regions of two strands of DNA that were not originally paired.
• intransitive verb To cause to produce a hybrid; crossbreed.

from The Century Dictionary.

• To cause to interbreed and thus produce hybrids.
• Hence—2. To form or construct in a hybrid manner, as words.
• To produce a hybrid or hybrids; cross or interbreed, as two different varieties or species of plants or animals.
• Also spelled hybridise.

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

• intransitive verb (Biol.) To produce hybrid offspring; to interbreed; to cross.
• transitive verb To render hybrid; to produce by mixture of stocks.

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

• verb transitive to cross-breed animals or plants to form hybrids
• verb transitive to construct a hybrid word from elements of different languages
• verb physics to combine atomic orbitals mathematically to form hybrid orbitals
• verb biochemistry to combine complementary subunits of multiple biological macromolecules

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb breed animals or plants using parents of different races and varieties