TREADLE

treadle|treddle. Treadle, or Treddle, n. a part of a loom, the sperm of cock

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Trea″dle (?), n. [[OE. tredyl a step, AS. tredel. See Tread.]] 1. 1. The part of a foot lathe, or other machine, which is pressed or moved by the foot.
2. 2. (Biol.) The chalaza of a bird's egg; the tread.