TREADER
Tread"er, n.
Defn: One who treads. Isa. xvi. 10.
TREADFOWL
Tread"fowl`, n.
Defn: A cock. [Obs.] Chaucer.
TREADLE
Trea"dle, n. Etym: [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.)
Defn: The chalaza of a bird's egg; the tread.
TREADMILL
Tread"mill`, n.
Defn: A mill worked by persons treading upon steps on the periphery of a wide wheel having a horizontal axis. It is used principally as a means of prison discipline. Also, a mill worked by horses, dogs, etc., treading an endless belt.