pitting 名詞
  孔蝕,藥液對容器的腐蝕
  Pit, v. t. [imp. & p. p. Pitted p. pr. & vb. n. Pitting.]
  1. To place or put into a pit or hole.
     They lived like beasts, and were pitted like beasts, tumbled into the grave.   --T. Grander.
  2. To mark with little hollows, as by various pustules; as, a face pitted by smallpox.
  3. To introduce as an antagonist; to set forward for or in a contest; as, to pit one dog against another.
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  pit
       n 1: a sizeable hole (usually in the ground); "they dug a pit to
            bury the body" [syn: cavity]
       2: a concavity in a surface (especially an anatomical
          depression) [syn: fossa]
       3: the hard inner (usually woody) layer of the pericarp of some
          fruits (as peaches or plums or cherries or olives) that
          contains the seed; "you should remove the stones from
          prunes before cooking" [syn: stone, endocarp]
       4: a trap in the form of a concealed hole [syn: pitfall]
       5: a surface excavation for extracting stone or slate; "a
          British term for `quarry' is `stone pit'" [syn: quarry,
          stone pit]
       6: lowered area in front of a stage where an orchestra
          accompanies the performers [syn: orchestra pit]
       7: a workplace consisting of a coal mine plus all the buildings
          and equipment connected with it [syn: colliery]
       v 1: set into opposition or rivalry; "let them match their best
            athletes against ours"; "pit a chess player against the
            Russian champion"; "He plays his two children off
            against each other" [syn: oppose, match, play off]
       2: mark with a scar; "The skin disease scarred his face
          permanently" [syn: scar, mark, pock]
       3: remove the pits from; "pit plums and cherries" [syn: stone]
       [also: pitting, pitted]
  pitting
       n : the formation of small pits in a surface as a consequence of
           corrosion [syn: roughness, indentation]