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tendril (n.)

"leafless plant-organ attaching to another for support," 1530s, from French tendrillon "bud, shoot, cartilage," perhaps a diminutive of tendron "cartilage," from Old French tendre "soft" (see tender (adj.)), or else from Latin tendere "to stretch, extend," from PIE root *ten- "to stretch."

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Definitions of tendril from WordNet

tendril (n.)
slender stem-like structure by which some twining plants attach themselves to an object for support;
From wordnet.princeton.edu