from
The Collaborative International Dictionary of English v.0.48
Heterogamy \Het`er*og"a*my\, n. [See {Heterogamous}.]
[1913 Webster]
1. (Bot.) The process of fertilization in plants by an
indirect or circuitous method; -- opposed to orthogamy.
[1913 Webster]
2. (Biol.) That form of alternate generation in which two
kinds of sexual generation, or a sexual and a
parthenogenetic generation, alternate; -- in distinction
from {metagenesis}, where sexual and asexual generations
alternate. --Claus & Sedgwick.
[1913 Webster]