water-dog noun. ['wɔ:tǝdɒg] LME.
[from WATER noun + DOG noun.]
1. A dog trained to enter water, esp. for retrieving waterfowl; any kind of dog that swims well. LME.

2. a. Any of various aquatic mammals; esp. the otter. Now rare. L16.
b. An aquatic N. American salamander of the genus Necturus; a mud puppy. M19.

3. A person at home on or in the water, as a sailor or swimmer. M17.

4. A small dark floating cloud supposed to indicate rain. Cf. DOG noun 10. E19.

[TahlilGaran] English Dictionary ▲