Meronymy

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 the opposite of 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'.