bristle
noun
one of the short, stiff, coarse hairs of certain animals, especially hogs, used extensively in making brushes.
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Professor Rhys, who considers the bristleless boar a symbol of darkness and cold, rather than of winter and cold, thinks it was without bristles because the darkness is shorn away by the sun.
From The Wind Among the Reeds by W. B. (William Butler) Yeats