Fourth, n. 1. One of four equal parts into which one whole may be
divided; the quotient of a unit divided by four; one coming next in
order after the third.
2. (Mus.) The interval of two tones and a semitone, embracing four
diatonic degrees of the scale; the subdominant of any key.
The Fourth, specifically, in the United States, the fourth day of July,
the anniversary of the declaration of American independence; as, to
celebrate the Fourth.
Fourth"ly, adv. In the fourth place.
Four"-way` (?), a. Allowing passage in either of four directions; as, a
four-way cock, or valve. Francis.
Four-way cock, a cock connected with four pipes or ports, and having
two or more passages in the plug, by which the adjacent pipes or ports
may be made to communicate; formerly used as a valve in the steam
engine, and now for various other purposes. In the illustration, a
leads to the upper end of a steam engine cylinder, and b to the lower
end; c is the steam pipe, and d the exhaust pipe.
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Four"-wheeled` (?), a. Having four wheels.