Webster's English Dictionary

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treadle

trea.dle \'tred-*l\ \'tred-lin, -*l-in\ n or trea.dling [ME tredel step of 
   a stair, fr. OE, fr. tredan] 1: a swiveling or lever device pressed by the 
   foot to drive a machine  2: CHALAZA  - treadle vi