Standard Lemma guide

pronucleus

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

noun

Meaning 1

Either of the two haploid nuclei (of a sperm and ovum) that fuse during fertilization

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

the nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: nucleus, cell nucleus, karyon

History

Etymology

Etymology tree English pro- Proto-Italic *knuks Latin nux Latin nucleuslbor. English nucleus English pronucleus From pro- + nucleus.

Across languages

Translations

1 source translations are retained for this English entry.

  • Italian: pronucleo — Translations