n (weightlifting) Any exercise performed by bending the arm, wrist, or leg on the exertion against resistance, especially those that train the biceps.
n (calculus|proper noun) The vector operator, denoted \rm{curl}\; or \vec{\nabla}\times\vec{\left(\cdot\right)}, that generates this field.
n (agriculture) Any of various diseases of plants causing the leaves or shoots to curl up; often specifically the potato curl.
n (music|especially|lutherie) The contrasting light and dark figure seen in wood used for stringed instrument making; the flame.
v (transitive|weightlifting) To exercise by bending the arm, wrist, or leg on the exertion against resistance, especially of the biceps.