Made of osiers; composed of, or containing, osiers.
source: Webster 1913
noun
flexible twig of a willow tree
source: WordNet 3.0
any of various willows having pliable twigs used in basketry and furniture
source: WordNet 3.0
A kind of willow (Salix viminalis) growing in wet places in Europe and Asia, and introduced into North America. It is considered the best of the willows for basket work. The name is sometimes given to any kind of willow.