terra alba

[al-buh, awl-]
any of various white, earthy or powdery substances, as pipe clay, gypsum, kaolin, or magnesia.

1870–75; < Latin: white earth

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World English Dictionary
terra alba (ˈælbə)
1.  a white finely powdered form of gypsum, used to make paints, paper, etc
2.  any of various other white earthy substances, such as kaolin, pipeclay, and magnesia
[from Latin, literally: white earth]

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