Definition of pickmaw in English:

pickmaw

Pronunciation /ˈpɪkmɔː/

noun

dialect Scottish, British
  • The black-headed gull, Larus ridibundus. Formerly also: †a tern (genus Sterna) (obsolete).

Origin

Early 16th century; earliest use found in Richard Holland (d. c1483), ecclesiastic and poet. Probably from pick, variant of pitch + maw, so called on account of the bird's black head.