Longman Dictionary of Contemporary English homepage

Topic: CIVIL

Sense: 1, 3
Origin: Old English dic 'ditch, dike'
Sense: 2
Date: 1900-2000
Origin: Probably from morphadyke 'male and female person, homosexual' (1900-2000), from hermaphrodite

dyke

 noun
     
dyke , dike [countable]
1TBTTW a wall or bank built to keep back water and prevent flooding
2 taboo informal an offensive word for a lesbian (=woman who is sexually attracted to women). Do not use this word.
3 especially British EnglishTECTB a narrow passage to carry water away [= ditch]
Definition of dyke from the Longman Dictionary of Contemporary English within
the topic CIVIL
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