The soft, curly hair from sheep and some other animals, used to make warm clothes and fabrics. It is known for keeping heat even when slightly wet.
From Old English 'wull', related to many Germanic words for the same material. The root goes back to very old Indo-European language stages.
Wool helped humans survive cold climates long before modern heating. Its structure traps air, turning a sheep’s coat—and your sweater—into natural insulation.
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