spur

spur (http://definr.com/spur)

     n 1: a verbalization that encourages you to attempt something;
          "the ceaseless prodding got on his nerves" [syn: goad,
           goading, prod, prodding, urging, spurring]
     2: any pointed projection [syn: spine]
     3: tubular extension at the base of the corolla in some flowers
     4: a sharp prod fixed to a rider's heel and used to urge a
        horse onward; "cowboys know not to squat with their spurs
        on" [syn: gad]
     5: a railway line connected to a trunk line [syn: branch line,
         spur track]
     v 1: incite or stimulate; "The Academy was formed to spur
          research"
     2: give heart or courage to [syn: goad]
     3: strike with a spur
     4: goad with spurs, as of horses when riding
     5: equip with spurs: "spur horses"