Trea″dle (?), n. [OE. tredyl a step, AS. tredel. See Tread.] 1. The part of a foot lathe, or other machine, which is pressed or moved by the foot.
2. (Biol.) The chalaza of a bird's egg; the tread.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.