Xiph'i·as noun [ Latin , a swordfish, a sword-shaped comet, from Greek xifi`as , from xi`fos a sword.] 1. (Zoology) A genus of fishes comprising the common swordfish. 2. (Anat.) (a) The constellation Dorado. (b) A comet shape... Found on http://www.encyclo.co.uk/webster/X/2