Plural of bike, short for bicycle - two-wheeled vehicles powered by pedaling. Can also refer to motorcycles in informal contexts.
Shortened form of 'bicycle', which comes from French 'bicyclette', from 'bi-' (two) and Greek 'kyklos' (circle, wheel). The abbreviation 'bike' emerged in the late 19th century as bicycles became more popular.
The word 'bike' is a perfect example of clipping - where a longer word gets shortened but retains its meaning. Interestingly, 'bike' can refer to both bicycles and motorcycles, showing how context determines meaning in modern usage.
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