narwhale
/ˈnɑrweɪl/
noun
- A medium-sized whale found in Arctic waters, the male of which has a long, spiraled tusk that is actually a tooth.
- The narwhale is sometimes called the 'unicorn of the sea' because of its long tusk.
- A pod of narwhales swam near the ice floes in the Arctic.
- Scientists are studying how narwhales use their tusks to sense changes in the ocean.