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From: DICT.TW English-Chinese Dictionary 英漢字典

 porcelain clay

From: Webster's Revised Unabridged Dictionary (1913)

 Por·ce·lain n.  A fine translucent or semitransculent kind of earthenware, made first in China and Japan, but now also in Europe and America; -- called also China, or China ware.
    Porcelain, by being pure, is apt to break.   --Dryden.
 Ivory porcelain, porcelain with a surface like ivory, produced by depolishing. See Depolishing.
 Porcelain clay. See under Clay.
 Porcelain crab Zool., any crab of the genus Porcellana and allied genera (family Porcellanidæ). They have a smooth, polished carapace.
 Porcelain jasper. Min. See Porcelanite.
 Porcelain printing, the transferring of an impression of an engraving to porcelain.
 Porcelain shell Zool., a cowry.

From: Webster's Revised Unabridged Dictionary (1913)

 Clay n.
 1. A soft earth, which is plastic, or may be molded with the hands, consisting of hydrous silicate of aluminium. It is the result of the wearing down and decomposition, in part, of rocks containing aluminous minerals, as granite. Lime, magnesia, oxide of iron, and other ingredients, are often present as impurities.
 2. Poetry & Script. Earth in general, as representing the elementary particles of the human body; hence, the human body as formed from such particles.
    I also am formed out of the clay.   --Job xxxiii. 6.
 The earth is covered thick with other clay,
 Which her own clay shall cover.   --Byron.
 Bowlder clay. See under Bowlder.
 Brick clay, the common clay, containing some iron, and therefore turning red when burned.
 Clay cold, cold as clay or earth; lifeless; inanimate.
 Clay ironstone, an ore of iron consisting of the oxide or carbonate of iron mixed with clay or sand.
 Clay marl, a whitish, smooth, chalky clay.
 Clay mill, a mill for mixing and tempering clay; a pug mill.
 Clay pit, a pit where clay is dug.
 Clay slate Min., argillaceous schist; argillite.
 Fatty clays, clays having a greasy feel; they are chemical compounds of water, silica, and aluminia, as halloysite, bole, etc.
 Fire clay , a variety of clay, entirely free from lime, iron, or an alkali, and therefore infusible, and used for fire brick.
 Porcelain clay, a very pure variety, formed directly from the decomposition of feldspar, and often called kaolin.
 Potter's clay, a tolerably pure kind, free from iron.

From: WordNet (r) 2.0

 porcelain clay
      n : 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, terra alba]