From Proto-Tai *cramꟲ (“cave”). Cognate with Thai ถ้ำ (tâm), Lao ຖ້ຳ (tham), Northern Thai ᨳ᩶ᩣᩴ, Khün ᨳ᩶ᩣᩴ, Tai Dam ꪖꪾ꫁, Lü ᦏᧄᧉ (ṫham²), Tày thẳm, Shan ထမ်ႈ (thām), Ahom 𑜌𑜪 (thaṃ), Zhuang gamj. Related to Vietnamese thẳm.
ᥗᥛᥲ (thàm) (1963 orthography ᥗᥛ̀)