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Wiktionary
leg curl

n. (context weightlifting English) An exercise performed on a machine in which the hamstring muscles are exerted to bend the knee while acting against resistance applied to the lower calf. The exercise may be performed while prone or standing, depending on the design of the machine.

WordNet
leg curl

n. an exercise designed to strength the flexor muscles of the leg [syn: leg curling]

Wikipedia
Leg curl

The leg curl is an isolation exercise that targets the hamstring muscles. The exercise involves flexing the lower leg against resistance towards the buttocks.

Other exercises that can be used to strengthen the hamstrings are the glute-ham raise and the deadlift.

Usage examples of "leg curl".

Ronnie lay on her stomach using the Leg Curl, flexing her calves over her back, heels nearly touching her butt.