Ratch

from WordNet (r) 3.0 (2006)

ratch
    n 1: mechanical device consisting of a toothed wheel or rack
         engaged with a pawl that permits it to move in only one
         direction [syn: {ratchet}, {rachet}, {ratch}]

from The Collaborative International Dictionary of English v.0.48

Ratch \Ratch\ (r[a^]ch), n. (Zool.)
   Same as {Rotche}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Ratch \Ratch\ (r[a^]ch), n. [See {Rack} the instrument,
   {Ratchet}.]
   A ratchet wheel, or notched bar, with which a pawl or click
   works.
   [1913 Webster]

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