terra alba (Noun) — Finely pulverized gypsum used especially as a pigment.
terra alba (Noun) — Fine white clay used in making tobacco pipes and pottery and in whitening leather.
terra alba (Noun) — A fine usually white clay formed by the weathering of aluminous minerals (as feldspar); used in ceramics and as an absorbent and as a filler (e.g., in paper).