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syzygy (astron.) †conjunction, (now) conjunction and opposition of two celestial bodies XVII; applied to various unions or combinations XIX. — late L. sȳzygia — Gr. suzugíā yoke, pair, conjunction, f. súzugos yoked, paired, f. SY- + *zug- YOKE.

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syzygy In certain types of protozoa, an association between potential gametocytes, prior to gamete formation, in which fusion of nuclei does not occur.