In by Jackie Dunn

A step; the horizontal board in a stairway on which the foot is placed.

Merriam-Webster Online Dictionary
tread (verb)
transitive verb
a) to step or walk on or over
b) to walk or proceed along - follow treading a fine line between tradition and innovation
a) to beat or press with the feet - trample
b) to subdue or repress as if by trampling - crush
to copulate with - used of a male bird
a) to form by - treading beat tread a path
intransitive verb
b) to execute by stepping or dancing - tread a measure
to move or proceed on or as if on foot - must tread lightly
a) to set foot - has gone where others fear to tread
b) to put one's foot - step carelessly treading on the flowers
- copulate
tread (noun)
a mark (as a footprint or the imprint of a tire) made by or as if by - treading
a) (1) the action of treading
(2) an act or instance of treading - step
b) manner of stepping
c) the sound of treading
a) the part of a shoe or boot sole that touches the ground , also the pattern on the bottom of a sole
b) (1) the part of a wheel or tire that makes contact with a road or rail
(2) the pattern of ridges or grooves made or cut in the face of a tire
the distance between the points of contact with the ground of the two front wheels or the two rear wheels of a vehicle
a) the upper horizontal part of a step
b) the width of such a tread
tread (Wikipedia)
Tire tread.jpg

The tread of a tire or track refers to the rubber on its circumference that makes contact with the road or the ground. As tires are used, the tread is worn off, limiting its effectiveness in providing traction. A worn tire can often be retreaded.

The word tread is often used casually to refer to the pattern of grooves molded into the rubber, but those grooves are correctly called the tread pattern, or simply the pattern. The grooves are not the tread, they are in the tread. This distinction is especially significant in the case of racing slicks, which have a lot of tread but no grooves.

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