Definition of haglet in English:

haglet

Pronunciation /ˈhaɡlɪt/

noun

dialect, rare Nautical
  • Any of various seabirds regarded as distinct from gulls, most often petrels, but also including shearwaters, fulmars, and kittiwakes.

Origin

Early 19th century; earliest use found in John Grant (1713–1814). Origin uncertain; perhaps from hag-, hack- + -let.