Tempera (also known as egg tempera, poster color or poster paint) is a type of artist's paint and associated art techniques that were known from the classical world, where it ...
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tempera n. A painting medium in which pigment is mixed with water-soluble glutinous materials such as size or egg yolk
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tem·per·a   (t m p r-) n. 1. A painting medium in which pigment is mixed with water-soluble glutinous materials such as size or egg yolk. Also called poster color, poster paint.
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From Dick Blick Art Materials - choose from an oustanding selection of tempera paints and accessories, including cakes, powder, and liquids.
http://www.dickblick.com/categories/tempera/

tempera (t?m`p?r?), painting method in which finely ground pigment is mixed with a solidifying base such as albumen, fig sap, or thin glue. When used in mural painting it is ...
http://encyclopedia2.thefreedictionary.com/tempera