n. A word that names an object from a single characteristic of it or of a closely related object; a word used in metonymy.
The Century Dictionary and Cyclopedia
n. A name given to a group (usually a genus) after a different name had been applied to another member (usually a species) of the same group. According to the American code of botanical nomenclature, a metonym is invalid.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a word that denotes one thing but refers to a related thing
Word Usage
"“Bartús” is evidently formed “on the weight” of “Bartút;” and his metonym is a caricature, a chaff fit for Fellahe."