Is “Layback” a Scrabble word?

1.A spin in which the head and shoulders are dropped backwards and the back arched downwards toward the ice. Also called a layback spin

2.A maneuver to scale a vertical crack, by pulling with the arms and jamming the legs underneath, and shuffling up on limb at a time.

3.A surf maneuver where the upright surfer leans back against the wave.

1.To climb using layback maneuvers.