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a. Any of various deciduous trees or shrubs of the genus Salix, having usually narrow leaves, unisexual flowers borne in catkins, and strong lightweight wood.
b. The wood of any of these trees.
2. Something, such as a cricket bat, that is made from willow.
3. A textile machine consisting of a spiked drum revolving inside a chamber fitted internally with spikes, used to open and clean unprocessed cotton or wool.
tr.v. wil·lowed, wil·low·ing, wil·lows
To open and clean (textile fibers) with a willow.

[Middle English wilowe, from Old English welig; see wel- in Indo-European roots.]