The skin or hide of a young horse, or leather made from such hide, prized for its softness.
From 'colt' + 'skin,' with both elements from Old English and Germanic roots. 'Skin' derives from Old Norse 'skinn' (hide), showing early Norse influence on English vocabulary.
Medieval leatherworkers distinguished between leather from different animals and ages—'coltskin' was considered particularly fine and supple, which is why it commanded premium prices in luxury markets.
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