Definition of French letter in English:

French letter

noun

British
informal, dated
  • A condom.

    • ‘According to the ad, ‘Julius would like to give you some straight talk about French letters.’’
    • ‘I had taken some trouble to insert among the smoked salmon and cream cheese, a French letter.’
    • ‘The new orthodoxy preached by the ostensibly liberal apostles of political correctness sanctifies the condom, no longer to be referred to disparagingly as the rubber Johnny or the French letter.’

Pronunciation

French letter