1) The leader of a team of dogs 
The term outrunner refers to a type of brushless motor primarily used in electrically propelled, radio-controlled model aircraft. This type of motor spins its outer shell around its windings, much like motors found in ordinary CD-ROM computer drives. In fact, CD-ROM motors are frequently rewound into brushless outrunner motors for small park flyer...
• (n.) An offshoot; a branch.
Out·run'ner noun An offshoot; a branch. [ R.] 'Some outrunner of the river.' Lauson. 
a person or thing that runs ahead or outside. · an attendant who runs before or beside a carriage. · the leader of a team of dogs. · a forerunner.