Pronunciation: (flang'kur),[key] —n. 1. a person or thing that flanks.
2. Mil.one of a body of soldiers placed on the flank of an army to guard a line of march.
3. Fort.a fortification projecting so as to defend another work or to command the flank of an assailing body.
4. Football. a. Also calledflank'er back". an offensive back who lines up outside of an end.
b. See split end.