homonym

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homonym

(hŏm′ə-nĭm′, hō′mə-)
n.
1. One of two or more words that have the same sound and often the same spelling but differ in meaning, such as bank (embankment) and bank (place where money is kept).
2.
a. A word used to designate several different things.
b. A namesake.
3. Biology A taxonomic name identical to one previously applied to a different species or other taxon and therefore unacceptable in its new use.

hom′o·nym′ic adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

homonym

a specific or generic name that has been used for two or more different organisms. The homonym published first is designated as ‘senior’, and ‘junior’ if published last.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005