tread

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tread

1. the outer part of a tyre or wheel that makes contact with the road, esp the grooved surface of a pneumatic tyre
2. the part of a rail that wheels touch
3. Vet science an injury to a horse's foot caused by the opposite foot, or the foot of another horse

tread

1. The horizontal upper surface of a step; includes the rounded edge or nosing which extends over the riser.
See also: Step
2. The horizontal upper surface of a step; includes the rounded edge or nosing which extends over the riser.

tread

[tred]
(civil engineering)
The horizontal part of a step in a staircase.
The distance between two successive risers in a staircase.
(engineering)
The part of a wheel or tire that bears on the road or rail.

tread

The horizontal surface of a step; often has a rounded edge that extends beyond the upright face of the riser below it.
References in classic literature ?
he asked, treading on the sack so that it squeaked.
These and many other expressions of ironical disapprobation having been exhausted, two or three of the out-of-door fellows began to hustle Nicholas and the young gentleman who had made the noise: stumbling against them by accident, and treading on their toes, and so forth.
So they began solemnly dancing round and round Alice, every now and then treading on her toes when they passed too close, and waving their forepaws to mark the time, while the Mock Turtle sang this, very slowly and sadly:--