osier

Short definition from Wiktionary

Noun

1. 1
   A willow, of species Salix viminalis, growing in wet places in Europe and Asia, and introduced into North America, considered the best willow for wickerwork.
2. 2
   Any kind of willow.
3. 3
   Long, pliable twigs of this plant, or of other similar plants.

Proper noun

1. 1
   A surname from French.