One of the mysteries of the English language finally explained.
1US. A type of tread on a tractor tyre, designed to give extra traction. Now rare.
2North American (chiefly Canadian). = power strip. [A trademark in the United States.]
3Originally US. 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.
power bar/ˈpaʊə bɑː/
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