Definition of napper in English:

napper

noun

British
informal
  • A person's head:

    ‘a couple of shaven nappers’
    • ‘When the Slovakian defender had cause to whack his napper at another careering ball, there was no doubt as to where it would end up.’
    • ‘Except he is not a man to allow his napper to reside in clouds, despite the club's fortunes taking off during his three-year stewardship.’
    • ‘Because having seen the photos of his napper, surely, there is no way he will be going anywhere without a cap pulled on to hide what he must realise now is a truly hideous do.’
    • ‘Thinking laterally, on my feet, using my napper, I, armed with scant information and a hazy memory, embark on tracking FYCB down on the dating site myself.’
    skull, cranium, crown
    View synonyms

Origin

Late 18th century: from thieves' slang, of unknown origin.

Pronunciation:

napper

/ˈnapə/