sea otter

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A large marine otter (Enhydra lutris) of northern Pacific coastal waters, formerly hunted for its soft, dark brown fur.

Century Dictionary and Cyclopedia

1. n. A marine otter, Enhydris marina, belonging to the family Mustelidæ and subfamily Enhydrinæ: distinguished from land-otter or river-otter. It inhabits the North Pacific; its fur is of great value, and its chase is an important industry. See cut under Enhydris.

Wiktionary

1. n. A marine mammal native to the northern Pacific Ocean, scientific name Enhydra lutris

GNU Webster's 1913

1. n. (Zoöl.) See in the Vocabulary.
2. (Zoöl.) An aquatic carnivore (Enhydris lutris syn. Enhydris marina) found in the North Pacific Ocean. Its fur is highly valued, especially by the Chinese. It is allied to the common otter, but is larger, with feet more decidedly webbed.

WordNet 3.0

1. n. large marine otter of northern Pacific coasts having very thick dark brown fur