cappel noun a horse 19-20. etymology: Scots ‘a horse or mare’; Older Scots capill, capyl, kapyll ‘a horse’, circa 1420; in later use specifically one used by a cadger; chiefly poetic; Middle English capil (circa 1290). Scots and Irish Gaelic capull, capall a horse, specifically a pack horse as opposed to a charger; ultimately from Latin caballus ‘a horse’; attested by Perthshire and Argyleshire Tinkler-Gypsies; also collected by McCormick note:

Hayward also records capal ‘a horse’ as Shelta and notes that often the Gypsies would use the back slang ‘lapac’ to confuse matters further.