Webster's English Dictionary

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sierra

si.er.ra \se--'er-*\ n [Sp, lit., saw, fr. L serra] 1a: a range of 
   mountains esp. with a serrated or irregular outline  1b: the country about 
   a sierra  2: any of various large fishes (genus Scomberomorus) that 
   resemble ma ckerel (as a cero or Spanish mackerel)Sierra  : - a 
   communications code word for the letter s