Xiphius

• (n.) A genus of cetaceans having a long, pointed, bony beak, usually two tusklike teeth in the lower jaw, but no teeth in the upper jaw.
Found on http://thinkexist.com/dictionary/meaning/xiphius/

Xiphius

Xiph'i·us noun [ New Latin , from Greek xi`fos a sword.] (Zoology) A genus of cetaceans having a long, pointed, bony beak, usually two tusklike teeth in the lower jaw, but no teeth in the upper jaw.
Found on http://www.encyclo.co.uk/webster/X/2
No exact match found