rachis
/ˈɹeɪkɪs/noun
rachis is spelled R-A-C-H-I-S: 6 letters. It appears about once in every 10 million words in written English, the 93,703rd most frequent word form (wordfreq, 2021 data). As a noun, rachis means “An anatomical shaft or axis in a marine invertebrate” (English Wiktionary, September 2026). The plural of rachis is rachises or rachides.
How many letters and syllables are in rachis?
| Letters | 6: R-A-C-H-I-S |
|---|---|
| In writing | about once in every 10 million words; the 93,703rd 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 rachis?
Rachis appears about once in every 10 million words in written English, the 93,703rd 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).
How do you pronounce rachis?
- US /ˈɹeɪkɪs/
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-rachis.wav, Wikimedia Commons (author and licence on each file's page).
Forms of rachis
- rachises plural
- rachides plural
- rhachis
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does rachis mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
obsoleteThe spinal column, or the vertebrae of the spine.
- 2
An anatomical shaft or axis in a marine invertebrate.
- 3
The central shaft of a feather.
- 4
The axis of either a compound leaf, inflorescence, or fern frond.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Rachis in Spanish, French, German and Portuguese
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 rachis come from?
From New Latin rhachis/rachis, from Ancient Greek ῥάχις (rhákhis, “spine, ridge”).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).