[1] : The Collaborative International Dictionary of English v.0.48

y \y\ wimac, n.; pl. y's wimacz 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
see also:
y's ys y level y moth plusia gamma gamma moth 
silver y 

Gamma >> G Words
Gamma, definition of term: Gamma
gamma_pag1.html

Moth >> M Words
Moth, definition of term: Moth
moth_pag1.html

Gamma Rays >> G Words
Gamma Rays, definition of term: Gamma Rays
gamma+rays_pag1.html

Gamma Ray >> G Words
Gamma Ray, definition of term: Gamma Ray
gamma+ray_pag1.html

Gamma Correctio >> G Words
Gamma Correctio, definition of term: Gamma Correctio
gamma+correctio_pag1.html

Gamma Radiation >> G Words
Gamma Radiation, definition of term: Gamma Radiation
gamma+radiation_pag1.html

Gamma Globulin >> G Words
Gamma Globulin, definition of term: Gamma Globulin
gamma+globulin_pag1.html

Imperial Moth >> I Words
Imperial Moth, definition of term: Imperial Moth
imperial+moth_pag1.html

Geometrid Moth >> G Words
Geometrid Moth, definition of term: Geometrid Moth
geometrid+moth_pag1.html

Gypsy Moth >> G Words
Gypsy Moth, definition of term: Gypsy Moth
gypsy+moth_pag1.html

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