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extrachromosomal

[ek-struh-kroh-muh-soh-muh l]
adjective Genetics.
  1. of or relating to DNA that exists outside the main chromosome and acts independently.
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Origin of extrachromosomal

First recorded in 1935–40; extra- + chromosomal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018