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

y \y\ wimac.
   y, the twenty-fifth letter of the english alphabet, at the
   beginning of a word or syllable, except when a prefix see
   y-, is usually a fricative vocal consonant; as a prefix, and
   usually in the middle or at the end of a syllable, it is a
   vowel. see guide to pronunciation, sectsect 145, 178-9,
   272.
   1913 webster

   note: it derives its form from the latin y, which is from the
         greek upsilon, originally the same letter as v.
         etymologically, it is most nearly related to u, i, o,
         and j. g; as in full, fill, as. fyllan; e. crypt,
         grotto; young, juvenile; day, as. daeg. see u, i,
         and j, g.
         1913 webster

   note: y has been called the pythagorean letter, because the
         greek letter upsilon was taken to represent the
         sacred triad, formed by the duad proceeding from the
         monad; and also because it represents the dividing of
         the paths of vice and virtue in the development of
         human life.
         1913 webster
see also:
u i j g 

[2] : 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 

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

y \y\ imac, pron.
   i. obs. --king horn. --wyclif.
   1913 webster y

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

y- \y-\, or i- \i-\ . oe. y-, i-, as. ge-, akin to d.  g. ge-,
   ohg. gi-, ga-, goth. ga-, and perhaps to latin con-;
   originally meaning, together. cf. com-, aware, enough,
   handiwork, ywis.
   a prefix of obscure meaning, originally used with verbs,
   adverbs, adjectives, nouns, and pronouns. in the middle
   english period, it was little employed except with verbs,
   being chiefly used with past participles, though occasionally
   with the infinitive. ycleped, or yclept, is perhaps the only
   word not entirely obsolete which shows this use.
   1913 webster

         that no wight mighte it see neither yheere. --chaucer.
   1913 webster

         neither to ben yburied nor ybrent.       --chaucer.
   1913 webster

   note: some examples of chaucer's use of this prefix are; ibe,
         ibeen, icaught, ycome, ydo, idoon, ygo, iproved,
         ywrought. it inough, enough, it is combined with an
         adjective. other examples are in the vocabulary.
         1913 webster spenser and later writers frequently
         employed this prefix when affecting an archaic style,
         and sometimes used it incorrectly.
         1913 webster
see also:
com- aware enough handiwork ywis 

[5] : WordNet (r) 2.0

y
     n 1: a silvery metallic element that is common in rare-earth
          minerals; used in magnesium and aluminum alloys syn: yttrium,
           atomic number 39
     2: the 25th letter of the roman alphabet
see also:
yttrium atomic number 39 

[6] : The Free On-line Dictionary of Computing (27 SEP 03)

y
     
        1. general purpose language syntactically like ratfor,
        semantically like c.  lacks structures and pointers.  used
        as a source language for jack w. davidson and christopher
        w. fraser's peephole optimiser which inspired gcc rtl and
        other optimisation ideas.
     
        ftp://ftp.cs.princeton.edu/pub/y+po.tar.z.  it is a copy
        of the original distribution from the university of arizona
        during the early 80's, totally unsupported.
     
        "the y programming language", d.r. hanson, sigplan notices
        162:59-68 feb 1981.
     
        jack w. davidson and christopher w. fraser, "the design and
        application of a retargetable peephole optimiser", toplas,
        apr.  1980.
     
        jack w. davidson, "simplifying code through peephole
        optimisation" technical report tr81-19, the university of
        arizona, tucson, az, 1981.
     
        jack w. davidson and christopher w. fraser, "register
        allocation and exhaustive peephole optimisation"
        software-practice and experience, sep. 1984.
     
        2. see fixed point combinator.
     
     
see also:
ratfor c gcc rtl lt;ftp://ftp.cs.princeton.edu/pub/y+po.tar.zgt; university of arizona 
fixed point combinator 

[7] : U.S. Gazetteer Places (2000)

y-o ranch, wy -- u.s. census designated place in wyoming
   population 2000:    242
   housing units 2000: 86
   land area 2000:     2.436005 sq. miles 6.309225 sq. km
   water area 2000:    0.000000 sq. miles 0.000000 sq. km
   total area 2000:    2.436005 sq. miles 6.309225 sq. km
   fips code:            86737
   located within:       wyoming wy, fips 56
   location:             42.035835 n, 104.939874 w
   zip codes 1990:    
   note: some zip codes may be omitted esp. for suburbs.
   headwords:
    y-o ranch, wy
    y-o ranch
    y, wy
    y

[8] : U.S. Gazetteer Places (2000)

y, ak -- u.s. census designated place in alaska
   population 2000:    956
   housing units 2000: 818
   land area 2000:     333.415653 sq. miles 863.542540 sq. km
   water area 2000:    3.107994 sq. miles 8.049668 sq. km
   total area 2000:    336.523647 sq. miles 871.592208 sq. km
   fips code:            86470
   located within:       alaska ak, fips 02
   location:             62.036803 n, 149.987154 w
   zip codes 1990:    
   note: some zip codes may be omitted esp. for suburbs.
   headwords:
    y, ak
    y

-Y >> Y Words
-Y, definition of term: -Y
-y_pag1.html