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2 definitions found
 for terra alba
From The Collaborative International Dictionary of English v.0.48 :

  Terra \Ter"ra\, n. [It. & L. See Terrace.]
     The earth; earth.
     [1913 Webster]
     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.
     Terrae 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
     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
     Terra ponderosa [L., ponderous earth] (Min.), barite, or
        heavy spar.
     Terra di Sienna. See Sienna.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  terra alba
      n 1: finely pulverized gypsum used especially as a pigment
      2: fine white clay used in making tobacco pipes and pottery and
         in whitening leather [syn: pipeclay, terra alba]
      3: 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) [syn: china
         clay, china stone, kaolin, kaoline, porcelain clay,
         terra alba]

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