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1 definition found
 for Y''s
From The Collaborative International Dictionary of English v.0.48 :

  Y \Y\ (w[imac]), n.; pl. Y's (w[imac]z) or Ys.
     Something shaped like the letter Y; a forked piece resembling
     in form the letter Y. Specifically:
     (a) One of the forked holders for supporting the telescope of
         a leveling instrument, or the axis of a theodolite; a
         wye.
     (b) A forked or bifurcated pipe fitting.
     (c) (Railroads) A portion of track consisting of two
         diverging tracks connected by a cross track.
         [1913 Webster]
  
     Y level (Surv.), an instrument for measuring differences of
        level by means of a telescope resting in Y's.
  
     Y moth (Zool.), a handsome European noctuid moth Plusia
        gamma) which has a bright, silvery mark, shaped like the
        letter Y, on each of the fore wings. Its larva, which is
        green with five dorsal white species, feeds on the
        cabbage, turnip, bean, etc. Called also gamma moth, and
        silver Y.
        [1913 Webster]

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