# castoreum

> English word · Noun

## Definitions
1. The bitter exudate of the castor sacs of mature beavers, used as a scent mark, and as a tincture in some perfumes.
2. A hat made from beaver fur.

## Etymology
From Latin castoreum, from Ancient Greek καστόριον (kastórion).

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