Etymology
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osier (n.)

species of willow with tough, flexible branches used in basket-work, c. 1300, "a willow switch," from 14c. of the tree itself, from Old French osier, ozier "willow twig" (13c.) and directly from Medieval Latin osera, osiera "willow," ausaria "willow bed," a word of unknown origin, perhaps from Gaulish. Old English had the word as oser, from Medieval Latin.

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Definitions of osier

osier (n.)
flexible twig of a willow tree;
osier (n.)
any of various willows having pliable twigs used in basketry and furniture;
From wordnet.princeton.edu