Definition from Wiktionary, the free dictionary
- (semantics) A term that denotes a whole whose part is denoted by another term, such as 'face' in relation to 'eye'.
- Body is a holonym of arm, leg and heart.
- Word is a holonym of letter.
- (term that denotes a whole): meronym
Derived terms 
a term that denotes a whole whose part is denoted by the other term
See also 
- (semantics) holonym