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Holonymy (in Greek holon = whole and onoma = name) is a semantic relation. Holonymy defines the relationship between a term denoting the whole and a term denoting a part of, or a member of, the whole. That is,

'X' is a holonym of 'Y' if Ys are parts of Xs, or

'X' is a holonym of 'Y' if Ys are members of Xs.

For example, 'tree' is a holonym of 'bark', of 'trunk' and of 'limb.'

Holonymy is the opposite of meronymy.

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