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Longman Dictionary of Contemporary English
ski boot
noun
EXAMPLES FROM CORPUS
▪ Salomon's radically different Adventure 7 boots, using even more ski boot technology, are still eagerly awaited for test.
▪ The concept of assessing foot volume instead of width to achieve a good fit is another idea borrowed from ski boot technology.
▪ This year, however, Lowa have produced a remarkable ski boot range.
WordNet
ski boot

n. a stiff boot that is fastened to a ski with a ski binding [syn: ski boots]

Wikipedia
Ski boot

Ski boots are footwear used in skiing to provide a way to attach the skier to skis using ski bindings. The ski/boot/binding combination is used to effectively transmit control inputs from the skier's legs to the snow.

Usage examples of "ski boot".

This was the picture posited by Karen: She saw something in her mindin between the smaller bikini and the itty-bitty bits of Valium, in between putting on a down coat or a ski boot one cold winter day, or maybe turning a TV channel or rounding a corner in her Honda.

His right foot was strapped into a walking cast that looked like a ski boot.