Entry 1 sense Webster, 1913 Skua · Sku·a · IPA /ˈskjuːə/ 01 n. Any jager gull; especially, the Megalestris skua; -- called also boatswain. 1. Any jager gull; especially, the Megalestris skua; -- called also boatswain.(Zool.) Also: boatswain