spon·son 
(spŏnsən)
(spŏnsən)n.
1. Any of several structures that project from the side of a boat or ship, especially a gun platform.
2. A short, curved, air-filled projection on the hull of a seaplane, imparting stability in the water.
[Perhaps alteration of EXPANSION.]
- atrophy
- atropin
- atropine
- Atropos
- ATSC
- at sea
- at service
- at sign
- Atsina
- at sixes and sevens
- at (someone's) beck and call
- at someone's beck and call
- at (someone's) door
- at someone's door
- at (someone's) feet
- at someone's feet
- at (someone's) service
- at someone's service
- at speed
- at stake
- at stud
- at swords' points
- att.
- attaboy
- attach