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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 cos
 萵苣的一種

From: WordNet (r) 2.0

 cos
      n 1: ratio of the adjacent side to the hypotenuse of a
           right-angled triangle [syn: cosine]
      2: lettuce with long dark-green leaves in a loosely packed
         elongated head [syn: cos lettuce, romaine, romaine
         lettuce]