castoreum
noun
castoreum is spelled C-A-S-T-O-R-E-U-M: 9 letters. It appears about once in every 47 million words in written English, the 211,986th most frequent word form (wordfreq, 2021 data). As a noun, castoreum means “The bitter exudate of the castor sacs of mature beavers, used as a scent mark, and as a tincture in some perfumes” (English Wiktionary, September 2026). The plural of castoreum is castoreums or castorea.
How many letters and syllables are in castoreum?
| Letters | 9: C-A-S-T-O-R-E-U-M |
|---|---|
| In writing | about once in every 47 million words; the 211,986th most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is castoreum?
Castoreum appears about once in every 47 million words in written English, the 211,986th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Forms of castoreum
- castoreums plural
- castorea plural
- castorium
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does castoreum mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
The bitter exudate of the castor sacs of mature beavers, used as a scent mark, and as a tincture in some perfumes.
- 2
archaicA hat made from beaver fur.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Castoreum in Spanish, French, German and Portuguese
In the sense castor sac exudate:
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does castoreum come from?
From Latin castoreum, from Ancient Greek καστόριον (kastórion).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).