nounC2Very rare — outside the 30,000 commonest English words, so you will meet it in writing rather than in speechToo rare in one of the two pools to compare — fewer than 20 uses in speech or in writing
An Arctic whale with one long straight tusk out of its head.
Definitions of narwhal
1nounnarwhalAn Arctic whale with one long straight tusk out of its head.C2