A naval officer of the highest rank; a naval officer of high rank, of which there are different grades. The chief gradations in rank are fleet admiral, admiral, vice admiral, and rear admiral. The admiral is the commander in chief of a fleet or of fleets. The ship which carries the admiral; also, the most considerable ship of a fleet. This is a rank in the navy of high command. In some countries it is the commander in chief of the naval forces.
- (Zoology) A handsome butterfly (Pyrameis Atalanta) of Europe and America. The larva feeds on nettles.