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

	

	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]

	

	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]