tufa, porous stone; volcanic tuff/tufa
Latin word, found 10 times in the texts on Socratos.
Ovid, Heroides 15.141: Antra vident oculi scabro pendentia tofo,
Ovid, Metamorphoses 3.160: et levibus tofis nativum duxerat arcum.
Juvenal, Saturae 1.3.20: herba, nec ingentium violarent marmora tofum.
All forms of tofus