1
: situated in or affecting the parts of a cell external to the nucleus : cytoplasmic
2
: situated outside the nucleus of an atom

Word History

First Known Use

1887, in the meaning defined at sense 1

Time Traveler
The first known use of extranuclear was in 1887

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Cite this Entry

“Extranuclear.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/extranuclear. Accessed 8 Jul. 2026.

Medical Definition

extranuclear

adjective
: situated in or affecting the parts of a cell external to the nucleus : cytoplasmic
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