Y

1. 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, 272.
2. Something shaped like the letter Y ; a forked piece resembling in form the letter Y .
3. One of the forked holders for supporting the telescope of a leveling instrument, or the axis of a theodolite; a wye.
4. A forked or bifurcated pipe fitting.
5. A portion of track consisting of two diverging tracks connected by a cross track.
6. I.

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