# tertial

> English word · Noun · IPA /ˈtɝʃl̩/

## Definitions
1. Any flight feather attached to the humerus (upper arm) of a bird.

## Etymology
From Latin tertius (“third”); the tertial feathers are the third row of feathers. By surface analysis, terti- + -al.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/word/tertial