Meronymy is a semantic relation. A meronym is the name of a constituent part of, the substance of, or a member of something. Meronymy is opposite to holonymy.

So:

X is a meronym of Y if X is a part of Y.
X is a meronym of Y if X is a substance of Y.
X is a meronym of Y if X is a member of Y.

  • 'Blue' is a meronym of 'colour'.
  • 'Doctor' is a meronym of 'professional'.
  • 'St Paul's Cathedral' is a meronym of 'Church of England'.

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