fres·co /ˈfrɛs(ˌ)ko/
  在新塗灰泥的牆壁上作的水彩畫,壁畫(vt.)作壁畫于
  Fres·co n.; pl. Frescoes or Frescos
  1. A cool, refreshing state of the air; duskiness; coolness; shade. [R.]
  2. Fine Arts (a) The art of painting on freshly spread plaster, before it dries. (b) In modern parlance, incorrectly applied to painting on plaster in any manner. (c) A painting on plaster in either of senses a and b.
  Fres·co, v. t. [imp. & p. p. Frescoed p. pr. & vb. n. Frescoing.] To paint in fresco, as walls.
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  fresco
       n 1: a mural done with watercolors on wet plaster
       2: a durable method of painting on a wall by using watercolors
          on wet plaster
       v : paint onto wet plaster on a wall
       [also: frescoes (pl)]