narwhal
/ˈnɑrwɑl/
noun
- A medium-sized Arctic whale (Monodon monoceros) with a long, spiraled tusk that is actually an elongated tooth, found in males.
- The narwhal is sometimes called the 'unicorn of the sea' because of its long tusk.
- Scientists study narwhals to learn how they survive in the freezing Arctic waters.
- A pod of narwhals swam gracefully beneath the ice, their tusks glinting in the dim light.