jerk

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jerk

 [jerk]
a sudden reflex or involuntary movement.
Achilles jerk (ankle jerk) plantar extension of the foot elicited by a tap on the achilles tendon, while the patient is seated on a bed or chair, with feet hanging freely; called also Achilles reflex and triceps surae jerk or reflex.
biceps jerk biceps reflex.
elbow jerk involuntary flexion of the elbow on striking the tendon of the biceps or triceps muscle.
jaw jerk jaw-jerk reflex.
knee jerk see knee jerk.
tendon jerk tendon reflex.
triceps surae jerk ankle jerk.

jerk

(jerk),
1. A sudden pull.
2. Synonym(s): deep reflex

jerk

(jĕrk)
1. A sudden pull.
2. Synonym(s): deep reflex.

jerk

1. A sudden involuntary movement, usually of the head or a limb.
2. A reflex muscle or muscle group contraction in response to a sudden stretching by briskly tapping the tendon. A tendon reflex.

jerk

(jĕrk)
A sudden pull.
References in periodicals archive ?
You'll still hit the target without aiming, but you'll miss it at this distance from jerking the gun out of alignment.
The most popular method of Jamaican cooking is "jerking" which is the traditional way of preparing highly-seasoned meat, slowly cooked over a fire-pit of pimento wood.
Gynaecological surgeon Dr Darshana Weersana told the inquest he could not recall whether he witnessed any jerking movements.