# planula

> English word · Noun · IPA /ˈplæn.jʊ.lə/

## Definitions
1. In embryonic development, a vesicle filled with fluid, formed from the morula by the divergence of its cells in such a manner as to give rise to a central space, around which the cells arrange themselves as an envelope; an embryonic form intermediate between the morula and gastrula.
2. The larva of a hydrozoan, which is free-swimming and covered in cilia.

## Etymology
Borrowed from Latin plānula, diminutive of plāna (“plane”).

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