nar·whal also nar·wal 
(närwəl) or nar·whale (-wāl′, -hwāl′)
(närwəl) or nar·whale (-wāl′, -hwāl′)n.
An Arctic whale (Monodon monoceros) having mottled gray or whitish skin and in the male, a long spirally twisted tusk projecting forward from the left side of the head.
[Norwegian or Danish narhval, from Old Norse nāhvalr : nār, corpse (from its whitish color) + hvalr, whale.]