Definition of tread noun from the Oxford Advanced American Dictionary

     

    tread

     noun
    noun
    NAmE//trɛd//
     
     
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  1. 1 [countable, uncountable] the raised pattern on the surface of a tire on a vehicle The treads on the tires were badly worn.
  2. 2 [singular] the way that someone walks; the sound that someone makes when they walk I heard his heavy tread on the stairs.
  3. 3 [countable] the upper surface of a step or stair compare riser
See the Oxford Advanced Learner's Dictionary entry: tread