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Wiktionary
kettlebell

n. (context weightlifting English) A weight consisting of a cast iron ball with a single handle for gripping the weight during exercise.

Wikipedia
Kettlebell

The kettlebell or girya is a cast-iron or cast steel weight (resembling a cannonball with a handle) used to perform ballistic exercises that combine cardiovascular, strength and flexibility training. They are also the primary equipment used in the weight lifting sport of girevoy sport. Russian kettlebells are traditionally measured in weight by pood, which (rounded to metric units) is defined as .