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2 definitions found
 for Syzygy
From The Collaborative International Dictionary of English v.0.48 :

  Syzygy \Syz"y*gy\ (s[i^]z"[i^]*j[y^]), n.; pl. Syzygies
     (-j[i^]z). [L. syzygia a joining together, conjunction, Gr.
     syzygi`a; sy`n with + zeygny`nai to join, zygo`n yoke: cf. F.
     syzygie. See Yoke, n.]
     1. (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]
  
     2. (Gr. & L. Pros.) The coupling together of different feet;
        as, in Greek verse, an iambic syzygy.
        [1913 Webster]
  
     3. (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]
  
     4. 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]

From WordNet (r) 3.0 (2006) :

  syzygy
      n 1: the straight line configuration of 3 celestial bodies (as
           the sun and earth and moon) in a gravitational system

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