Span

Distance between the pins on a sculling shell.

Spread

Distance between the pin and the centerline of the shell.

Square Blades

Rowing with oars perpendicular to the surface of the water. 

Squaring

A gradual rolling of the oar blade from a position parallel to the water to a position (almost) perpendicular to the surface of the water. This is accomplished during the recovery portion of the rowing cycle and is done in preparation for the catch. 

Stakeboat

Fixture at the starting line of a sprint race that holds a person who holds the stern prior to the start of the race.

Starboard

The right side of the shell when facing the bow (bow side in the UK and Ireland). 

Steady State

Long, aerobic piece.

Stern 

The rear end of the shell

Stroke

A single cycle of the oar. Also, the rower sitting nearest the stern (and the coxswain, if there is one). The stroke is responsible for setting the stroke length and cadence (with the coxswain's gentle advice). 

Sweep Rowing

Rowing where each rower has one oar.

Swing

The layback toward the bow during the drive. In team boats, also refers to the synchronicity of this movement among the crew. 

Tandem rigging 

Variations of rigging of sweep boats with adjacent riggers being on the same side of the boat.