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Webster 1913 Edition

(răch)

Noun.

(Zool.)

Same as

(răch)

Noun.

[See

the instrument,

A ratchet wheel, or notched bar, with which a pawl or click works.

Noun.

In clock work, a sort of wheel having twelve fangs, which serve to lift the detents every hour and thereby cause the clock to strike.

ratch ‎(plural ratches)