cu·tin /ˈkjutṇ/
  表皮素,蠟狀質
  Cu·tin n.  Plant Physiol. A waxy substance containing fatty acids, soaps, and resinous material which, combined with cellulose, forms a substance nearly impervious to water and constituting the cuticle in plants.
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  cut-in
       n 1: (broadcasting) a local announcement inserted into a network
            program [syn: insert]
       2: (film) a still picture that is inserted and that interrupts
          the action of a film [syn: insert]