# thylakoid

> English word · Noun

## Definitions
1. a folded membrane within plant chloroplasts from which grana are made, used in photosynthesis

## Etymology
From Ancient Greek θύλακος (thúlakos, “sack, bag”) + -oid.

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