the commander in chief of a fleet.

a naval officer of the highest rank.

a naval officer of a high rank

the grades in the U.S. Navy are fleet admiral, admiral, vice-admiral, and rear admiral.

Obsolete . the flagship of an admiral.

British . a master who directs a fishing fleet.

any of several often brightly colored butterflies of the family Nymphalidae, as Vanessa atalanta (red admiral).