tufa
tu.fa \'t(y)u:-f*\ \t(y)u:-'fa--sh*s\ n [It tufo, fr. L tophus] 1: TUFF 2: a porous rock formed as a deposit from springs or streams - tu.fa.ceous aj
Webster's English Dictionarytu.fa \'t(y)u:-f*\ \t(y)u:-'fa--sh*s\ n [It tufo, fr. L tophus] 1: TUFF 2: a porous rock formed as a deposit from springs or streams - tu.fa.ceous aj