tread·le 
(trĕdl)
(trĕdl)n.
A pedal or lever operated by the foot for circular drive, as in a potter's wheel or sewing machine.
intr.v. tread·led, tread·ling, tread·les
To work a treadle.
[Middle English tredel, from Old English, step of a stair, from tredan, to tread.]
treadler n.
- Denis
- denitrification
- denitrify
- denitrifying bacterium
- denizen
- denizenation
- Denmark
- Denmark
- Denmark Strait
- den mother
- Dennis
- denominable
- denominal
- denominally
- denominate
- denomination
- denominational
- denominationalism
- denominationalist
- denominationally
- denominative
- denominator
- denotable
- denotation
- denotative