# unionoid

> English word · Noun

## Definitions
1. Any member of the family Unionidae or its order Unionida of freshwater mussels.

## Etymology
From taxonomic name Unio (with insertion of -n- after its etymon, Classical Latin ūniō (stem ūniōn-)) + -oid. Compare earlier unionid and taxonomic name Unionioda.

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