Webster's English Dictionary

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admiral

ad.mi.ral \'ad-m(*-)r*l\ n [ME, fr. MF amiral admiral & ML admiralis emir, 
   admirallus ad]miral, fr. Ar ami-r -al- commander of the (as in 
   ami-r-al-bahr commander of the sea) archaic  1: the commander in chief of a 
   navy  2a: a naval officer of flag rank  2b: a commissioned officer in the 
   navy ranking above a vice admiral and below a fleet admiral archaic  3: 
   FLAGSHIP  4: any of several brightly colored butterflies (family 
   Nymphalidae)