The opposite of endogamy:

  1. Sexual reproduction between organisms which are completely unrelated to each other.
  2. Marriage between members of different groups, classes, or communities.

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.

Ex*og"a*my (?), n.

The custom, or tribal law, which prohibits marriage between members of the same tribe; marriage outside of the tribe; -- opposed to endogamy.

Lubbock.

 

© Webster 1913.

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