Etymology
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sidewinder (n.)

small horned rattlesnake of southwestern U.S., 1875, American English, from side (adj.) + agent noun of wind (v.1), so called in reference to its "peculiar lateral progressive motion." Also sidewiper (1888).

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Definitions of sidewinder

sidewinder (n.)
small pale-colored desert rattlesnake of southwestern United States; body moves in an s-shaped curve;
Synonyms: horned rattlesnake / Crotalus cerastes
sidewinder (n.)
air-to-air missile with infrared homing device;
From wordnet.princeton.edu