The Collaborative International Dictionary of English v.0.48:
Dingey \Din"gey\, Dingy \Din"gy\, Dinghy \Din"ghy\, n. [Bengalee
1. a small boat propelled by oars or sails, used in the East
Indies, in sheltered waters. [Written also dinghey.]
2. a small boat intended to be used as a tender or lifeboat,
carried or towed by a ship. It may be propelled by oars,
sail, or a motor.
3. a small boat of shallow draft with cross thwarts for seats
and rowlocks for oars with which it is propelled.
Syn: dory, rowboat.