Basic Guidelines For English Spellings
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1US rare A type of tread on a tractor tyre, designed to give extra traction.
2North American (chiefly Canadian). = power strip .
A trademark in the United States.
3US A trademark for: a type of snack food in the form of a bar, intended to give energy and nutrition in a concentrated form.
1940s; earliest use found in The Nebraska State Journal. From power + bar.