extrachromosomal

[ ek-struh-kroh-muh-soh-muh l ]
/ ˌɛk strəˌkroʊ məˈsoʊ məl /

adjective Genetics.

of or relating to DNA that exists outside the main chromosome and acts independently.

Origin of extrachromosomal

First recorded in 1935–40; extra- + chromosomal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019