Genetics. having unlike gametes, or reproducing by the union of such gametes (opposed to isogamous ).
Botany. having flowers or florets of two sexually different kinds (opposed to homogamous ).

1830–40; hetero- + -gamous

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World English Dictionary
heterogamy (ˌhɛtəˈrɒɡəmɪ)
1.  Compare isogamy a type of sexual reproduction in which the gametes differ in both size and form
2.  a condition in which different types of reproduction occur in successive generations of an organism
3.  Compare homogamy the presence of both male and female flowers in one inflorescence

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American Heritage
Medical Dictionary

heterogamous het·er·og·a·mous (hět'ə-rŏg'ə-məs)
Relating to heterogamy.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
heterogamy   (hět'ə-rŏg'ə-mē)  Pronunciation Key 
  1. Alternation of sexual and parthenogenetic generations, as in the life cycles of some aphids.

  2. A reproductive system that is characterized by the fusion of gametes (called heterogametes) that are dissimilar in size and structure, such as the egg and sperm of animals.

heterogamous adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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