# mastidion

> English word · Noun

## Definitions
1. A projection or bump on the chelicerae.

## Etymology
From Ancient Greek μαστίδιον (mastídion), diminutive of μαστός (mastós, “breast(-shaped object”). Compare mastoid.

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