aerobars
  a handlebar extension enabling the rider to use a more aerodynamic
position
 bonk
  running out of energy during a race a.k.a. hitting the wall
 buoy
  a float used to mark the swim course
 blocking
  riding in the passing lane
 brick
  a bike/run workout
 drafting
  the technique of riding in a pack during the cycling event
 lemming start
  a triathlon start where the competitors start one at a time
 mass start
  a triathlon start where all of the competitors start at the same time
instead
 of in waves
 roadie
  a cyclist that does not to triathlons and hates triathletes
 RST
  rec.sport.triathlon
 split
  the time taken to complete an individual leg of a triathlon
 transition
  the period/area between legs of a triathlon where participants change
 equipment/clothing for the next leg
 T1
  the swim to bike transition
 T2
  the bike to run transition
 wave
  a group of triathletes starting together as opposed to a mass start