nu·​cle·​oid ˈnü-klē-ˌȯid How to pronounce nucleoid (audio)
: the DNA-containing area of a prokaryotic cell (such as a bacterium)

Word History

First Known Use

1938, in the meaning defined above

Time Traveler
The first known use of nucleoid was in 1938

Dictionary Entries Near nucleoid

Cite this Entry

“Nucleoid.” Dictionary, Merriam-Webster, Accessed 21 Apr. 2024.

Medical Definition


1 of 2 adjective
nu·​cle·​oid ˈn(y)ü-klē-ˌȯid How to pronounce nucleoid (audio)
: resembling a nucleus


2 of 2 noun
: the DNA-containing area of a prokaryotic cell (as a bacterium)
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