GNU Collaborative International Dictionary of English

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1.       
   Syzygy , n.; pl. Syzygies . [L. syzygia a joining together, conjunction, Gr. συζυγία; σύν with + ζευγνύναι to join, ζυγόν yoke: cf. F. syzygie. See Yoke, n.]
   (Astron.) The point of an orbit, as of the moon or a planet, at which it is in conjunction or opposition; -- commonly used in the plural.
   1913 Webster
   (Gr. & L. Pros.) The coupling together of different feet; as, in Greek verse, an iambic syzygy.
   1913 Webster
   (Zool.) (a) Any one of the segments of an arm of a crinoid composed of two joints so closely united that the line of union is obliterated on the outer, though visible on the inner, side. (b) The immovable union of two joints of a crinoidal arm.
   1913 Webster
   The intimately united and apparently fused condition of certain low organisms during conjugation.
   Line of syzygies (Astron.), the straight line connecting the earth, the sun, and the moon or a planet, when the latter is in conjunction or opposition; -- used chiefly of the moon.
   1913 Webster