Definition of willow:

part of speech: noun

A plant growing freely in a moist soil, whose twigs or branches are very flexible, and are extensively employed in the manufacture of all kinds of basket- work; a tree having slender, pliant branches, often of large size.

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ronde bosse

In arch., a term applied to sculptured objects in their full forms, in contradistinction to those which are in relief, or attached more or less to a plane or ground. ...