Terra alba[L., white earth](Com.), a white amorphous earthy substance consisting of burnt gypsum, aluminium silicate (kaolin), or some similar ingredient, as magnesia. It is sometimes used to adulterate certain foods, spices, candies, paints, etc. -- Terra cotta. [It., fr. terra earth + cotta, fem. of cotto cooked, L. coctus, p. p. of coquere to cook. See Cook, n.]Baked clay; a kind of hard pottery used for statues, architectural decorations, figures, vases, and the like. -- Terræ filius[L., son of the earth], formerly, one appointed to write a satirical Latin poem at the public acts in the University of Oxford; -- not unlike the prevaricator at Cambridge, England. -- Terra firma[L.], firm or solid earth, as opposed to water. -- Terra Japonica. [NL.]Same as Gambier. It was formerly supposed to be a kind of earth from Japan. -- Terra Lemnia[L., Lemnian earth], Lemnian earth. See under Lemnian. -- Terra ponderosa[L., ponderous earth](Min.), barite, or heavy spar. -- Terra di Sienna. See Sienna.