pronucleus
noun
pro·nu·cle·us
(ˌ)prō-ˈnü-klē-əs 
-ˈnyü-
: the haploid nucleus of a male or female gamete (such as an egg or sperm) up to the time of fusion with that of another gamete in fertilization
Examples of pronucleus in a Sentence
Recent Examples on the Web
Pronuclear transfer is the easier and cheaper method since the pronucleus is larger and easier to image and transfer than the spindle.
—
Radhika Viswanathan, Vox, 24 July 2018
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Radhika Viswanathan, Vox, 24 July 2018
Cite this Entry
“Pronucleus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pronucleus. Accessed 6 Jul. 2025.
Copy CitationMedical Definition
pronucleus
noun
pro·nu·cle·us
(ˈ)prō-ˈn(y)ü-klē-əs
plural pronuclei
-klē-ˌī
also pronucleuses
also pronucleuses
: the haploid nucleus of a male or female gamete (as an egg or sperm) up to the time of fusion with that of another gamete in fertilization see female pronucleus, male pronucleus
Love words? Need even more definitions?
Merriam-Webster unabridged
Share