# rhamphotheca

> English word · Noun

## Definitions
1. A thin horny sheath of keratin on the outer surface of a bird's beak

## Etymology
From Ancient Greek ῥάμφος (rhámphos, “beak”) + theca.

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