Definition of sidewinder
1 : a heavy swinging blow from the side
2 : a small pale-colored desert rattlesnake (Crotalus cerastes) of the southwestern U.S. that moves by thrusting its body diagonally forward in a series of flat S-shaped curves
First Known Use of sidewinder
Medical Definition of sidewinder
: a small pale-colored venomous rattlesnake of the genus Crotalus (C. cerastes) of the southwestern United States that moves by thrusting its body diagonally forward in a series of S-shaped curves—called also horned rattlesnake
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