tufa (n.)youdaoicibaDictYouDict[tufa 词源字典]
type of porous rock, 1770, from Italian tufa "tufa, porous rock," probably from Latin tufus, tophus "loose, porous volcanic rock," said to be an Oscan-Umbrian loan-word. Related: Tufaceous.[tufa etymology, tufa origin, 英语词源]