From Middle English thinne, thunne, thenne, from Old English þynne, from Proto-West Germanic *þunnī, from Proto-Germanic *þunnuz – compare *þanjaną – from Proto-Indo-European *ténh₂us ("thin"), from *ten-.
Cognate with German dünn, Dutch dun, West Frisian tin, Icelandic þunnur, Danish tynd, Swedish tunn, Latin tenuis, Irish tanaí, Welsh tenau, Latvian tievs, Sanskrit तनु ("thin"), Persian تنگ. tenuis. Also related to tenuous.
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