Zyg″o‐sperm (?), n. [Gr. ζυγόν a yoke + E. sperm.] (Bot.) A spore formed by the union of the contents of two similar cells, either of the same or of distinct individual plants. Zygosperms are found in certain orders of algæ and fungi.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.