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Meaning of extrachromosomal

ex•tra•chro•mo•so•mal

Pronunciation: (ek"stru-krō"mu-sō'mul), [key]
— adj. Genetics.
  1. of or pertaining to DNA that exists outside the main chromosome and acts independently.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.