# thelyblast

> English word · Noun

## Definitions
1. The nucleus of the impregnated ovum, as distinguished from that of the spermatozoon (called the masculonucleus or arsenoblast).

## Etymology
From Ancient Greek θῆλυς (thêlus, “female”) + -blast.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/thelyblast