tūfa, ae, f.,
a kind of helmet-crest; or, acc. to others, a kind of military standard , Veg. Mil. 3, 5; cf. Lyd. Magistr. 1, 8 (hence the Fr. toupet ).
·- A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria. II. Tufa ·- ...
Webster's Dictionary of the English Language
·noun ·see under <<Calcite>>. ...