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From The Collaborative International Dictionary of English v.0.48:
Zygophyte \Zy"go*phyte\, n. [Gr. zygo`n a yoke + fyto`n a plant.] (Bot.) Any plant of a proposed class or grand division (Zygophytes, Zygophyta, or Zygosporeae), in which reproduction consists in the union of two similar cells. Cf. Oophyte. [1913 Webster + CM]