opac·i·ty /oˈpæsəti/
  不透明,電波不透過,不透明體
  opac·i·ty /oˈpæsətɪ/ 名詞
  不透明性,混濁,不透明,不透光,不透明區,濁斑
  opacity
  不透明性; 暗度
  O·pac·i·ty n.
  1. The state of being opaque; the quality of a body which renders it impervious to the rays of light; want of transparency; opaqueness.
  2. Obscurity; want of clearness.
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  opacity
       n 1: the phenomenon of not permitting the passage of
            electromagnetic radiation [ant: transparency]
       2: incomprehensibility resulting from obscurity of meaning
          [syn: opaqueness]
       3: the quality of being opaque to a degree; the degree to which
          something reduces the passage of light [syn: opaqueness]
          [ant: clearness]