köken: From Middle Dutch dickede, from Old Dutch [Term?], from Proto-West Germanic *þikkwīþu; compare Old High German dikkida. By surface analysis, dik + -te.
köken: 厚 (atsu, the stem of adjective 厚い (atsui, “thick”)) + み (-mi, “-ness”, in reference to quality, contrasting with suffix さ (-sa, “-ness”) that is used to describe degree).
köken: First attested in the Gugeupganibang eonhae (救急簡易方諺解 / 구급간이방언해), 1489, as Middle Korean 둗긔 (Yale: twutkuy). From the adjectival root twutk- (“thick”, whence Middle Korean 둗겁— (twutkep-), Korean 두껍— (dukkeop-)) + noun suffix —의 (-uy).
köken: From Proto-Vietic *k-daj. Cognate with Muong Bi tày. Attested in Phật thuyết đại báo phụ mẫu ân trọng kinh (佛說大報父母恩重經; c. 12th cent.) as ⿰苔巨, composed of 巨 (MC gjoX) + 苔 (MC doj) (modern SV: cự đài).
aile: dạ dày, dày cộm, dày công, dày cui, dày dặn, dày đặc, mặt dày, trời cao đất dày