ultramafic
adjective, noun
ultramafic is spelled U-L-T-R-A-M-A-F-I-C: 10 letters. It appears about once in every 10 million words in written English, the 92,628th most frequent word form (wordfreq, 2021 data). As an adjective, ultramafic means “Describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle” (English Wiktionary, September 2026).
How many letters and syllables are in ultramafic?
| Letters | 10: U-L-T-R-A-M-A-F-I-C |
|---|---|
| In writing | about once in every 10 million words; the 92,628th 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 ultramafic?
Ultramafic appears about once in every 10 million words in written English, the 92,628th 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 ultramafic
- more ultramafic comparative
- most ultramafic superlative
- ultramafics plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does ultramafic mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
Describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle.
noun
- 1
A rock with such properties.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Where does ultramafic come from?
From ultra- + mafic.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).