TWAIN Meaning of TWAIN in English [twain] adj [ME, fr. OE twegen--more at two] (bef. 12c) archaic: two [2]twain pron (bef. 12c): two; esp: two fathoms "mark ~" [3]twain n (14c) 1: two 2: couple, pair Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012