Pronucleus

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
Either of the two haploid nuclei (of a sperm and ovum) that fuse during fertilization
2
the nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote wordnet

Etymology

From pro- + nucleus.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.