# thallus

> English word · Noun · IPA /ˈθæl.əs/ · frequency rank #89,988

## Definitions
1. An undifferentiated plant body, such as in algae.
2. Any plant body lacking vascular tissue.

## Etymology
From Ancient Greek θαλλός (thallós, “young shoot, twig”), from Proto-Indo-European *dʰelh₁- (“to bloom”).

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