tor

From Middle English tor, torr-, from Old English torr, tor (“a high rock, lofty hill, tower”), possibly from Proto-Celtic, compare Old Welsh *tor (“hill”); ultimately from Latin turris (“tower”), from Ancient Greek τύρρις (túrrhis), τύρσις (túrsis, “tower”), of non-Indo-European origin. Cognate with Cornish tor, Scottish Gaelic tòrr, Welsh twr, Irish tor, French tor, and Romansh tor/tur/tuor; the first four are Celtic (from Latin turris), the last two directly from Latin turris (from Ancient Greek τύρρις (túrrhis) and τύρσις (túrsis)). It is not clear whether the Celtic forms were borrowed from Old English or vice versa. Doublet of tourelle, tower, and turret.

出典: Wiktionary「tor」（CC BY-SA 4.0）