O″ö‐spore (?), n. [Gr. ῳὄν an egg + � a seed.] (Bot.) (a) A special kind of spore resulting from the fertilization of an oösphere by antherozoids. (b) A fertilized oösphere in the ovule of a flowering plant.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.