# mesopterygium

> English word · Noun

## Definitions
1. The middle one of the three main basal plates in the fins of certain fishes.

## Etymology
Ancient Greek meso- middle + a fin.

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