DICT.TW Dictionary Taiwan

 ser·ra·tion /səˈreʃən, sɛ-/
 鋸齒狀,鋸齒狀突起

 Ser·ra·tion n.
 1. Condition of being serrate; formation in the shape of a saw.
 2. One of the teeth in a serrate or serrulate margin.
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 serration
      n 1: the condition of being serrated; "the serrations of a city
           skyline"
      2: a row of notches; "the pliers had serrations to improve the
         grip"
      3: a single notch in a row of notches; "one of the serrations
         was broken off"