Tor
Old English torr, perhaps of Celtic origin and related to Welsh tor ‘belly’ and Scottish Gaelic tòrr ‘bulging hill’.
wiktionary
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 tŵr, Irish tor, French tor, and Romansch tor/ tur/ tuor; the first four are from Proto-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 tower.
tor ( comparative more tor, superlative most tor)
etymonline
tor (n.)
"high, rocky hill," Old English torr "rock, crag;" said to be a different word than torr "tower." Obviously cognate with Gaelic torr "lofty hill, mound," Old Welsh twrr "heap, pile;" and perhaps ultimately with Latin turris "high structure" (see tower (n.)). But sources disagree on whether the Celts borrowed it from the Anglo-Saxons or the other way round.
