Source : Webster's Revised Unabridged Dictionary (1913)

Skua \Sku"a\, n. [Icel. sk?fr, sk?mr.] (Zo["o]l.)
   Any jager gull; especially, the {Megalestris skua}; -- called
   also {boatswain}.

Source : WordNet®

skua
     n : gull-like jaeger of northern seas [syn: {bonxie}]