Etymology

T'ien-men

Mandarin 天門 /天门
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The story

  1. Mandarin · borrowed from天門 /天门
  2. English todayT'ien-men

From Mandarin 天門 /天门 (Tiānmén), Wade–Giles romanization: Tʻien¹-mên².

Etymology from Wiktionary, CC BY-SA 4.0.