American Heritage® Dictionary of the English Language, Fourth Edition
- n. The regular alternation of forms or of mode of reproduction in the life cycle of an organism, such as the alternation between diploid and haploid phases, or between sexual and asexual reproductive cycles. Also called metagenesis, xenogenesis.
- n. biology metagenesis
- n. the alternation of two or more different forms in the life cycle of a plant or animal
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