Treadle
Pronunciation : Trea"dle
Part of Speech : n.
Etymology : [OE. tredyl a step, AS. tredel. See Tread.]
Definition : 1. The part of a foot lathe, or other machine, which is pressed or moved by the foot.
2. (Biol.)
Defn: The chalaza of a bird's egg; the tread.
Source : Webster's Unabridged Dictionary, 1913