Testáceus, Adie. Made of tile or earth baked: that hath a shell. vt opus testaceum. Plin. iun.Any thing made of earth nealed with fire.Testacea operimenta. Pli. Shels that couer fishes.
Lewis and Short: Latin dictionary
testācĕus (TESTACIVS, Inscr. Orell. 4353), a, um, adj. [testa]. I.Consisting of bricks or tiles, brick-, tile-: structura, Vitr. 2, 8 fin.: pavimentum, id., 7, 4, fin.: Col. 1, 6, 13: opus, Plin. Ep. 10, 37, 2; 10, 39, 4: MONVMENTVM, Inscr. Orell. 4354. — B.Subst.: testācĕum, i, n., a kind of brick, Plin. 36, 23, 55, 176; Pall. Mai. 11, 3.—II.Covered with a shell, testaceous: omnia,