Y (ī), pron. I. [Obs.]
King Horn. Wyclif.
Y (wī). 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, §§ 145, 178-9,
It derives its form from the Latin Y, which is from the Greek
Υ, 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. dæg. See U, I, and
☞ Y has been called the Pythagorean letter, because the
Greek letter Υ was taken 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
Y (wī), n.; pl.
Y's (wīz) 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
Y level (Surv.), an instrument for
measuring differences of level by means of a telescope resting in
Y's. -- Y moth
(Zoöl.), 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