definition
A piece or lock of curling hair; a ringlet.
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A curved stroke or shape.
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A spin making the trajectory of an object curve.
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Movement of a moving rock away from a straight line.
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Any exercise performed by bending the arm, wrist, or leg on the exertion against resistance, especially those that train the biceps.
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The vector field denoting the rotationality of a given vector field.
example
The curl of the vector field \vec{F}(x,y,z) is the vector field \operatorname{curl}\,\vec{F} \equiv \vec{\nabla}\times\vec{F}=\left( \frac{\partial F_z}{\partial y} - \frac{\partial F_y}{\partial z}, \frac{\partial F_x}{\partial z} - \frac{\partial F_z}{\partial x}, \frac{\partial F_y}{\partial x} - \frac{\partial F_x}{\partial y} \right).
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(proper noun) The vector operator, denoted \rm{curl}\; or \vec{\nabla}\times\vec{\left(\cdot\right)}, that generates this field.
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Any of various diseases of plants causing the leaves or shoots to curl up; often specifically the potato curl.
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The contrasting light and dark figure seen in wood used for stringed instrument making; the flame.
example
The one-piece back is of a medium curl.
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A pattern where the receiver appears to be running a fly pattern but after a set number of steps or yards quickly stops and turns around, looking for a pass.