isopropyl
"isopropyl" is a 9-letter English headword indexed on PlainSpell.
The verdict
“isopropyl” is uncommon English (frequency #54,264 among 17,902 “I” headwords), classed as a noun. The kind of spelling people second-guess.
- #54,264
- frequency rank, English
- 17,902
- “I” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The univalent organic radical (CH₃)₂CH-.
| Property | Value |
|---|---|
| Headword | isopropyl |
| Language | English |
| Part of speech | Noun |
| Letters | 9 |
| Frequency rank | #54,264 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “isopropyl” sits in English frequency
Rare enough to double-check
isopropyl is uncommon English at frequency #54,264 among 17,902 “I” headwords, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "The univalent organic radical (CH₃)₂CH-.".
Our edit-distance generator produced no likely misspellings for isopropyl, since its letter sequence doesn't invite the usual edit-distance slips. No confusable counterpart is on file for this word, since no other headword is close enough in sound or shape to pair with it.
Etymologically, the entry records: From iso- + propyl. The correct English form is isopropyl, spelled I-S-O-P-R-O-P-Y-L.
Definition
- 1The univalent organic radical (CH₃)₂CH-.
Etymology
From iso- + propyl.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “isopropyl”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is I-S-O-P-R-O-P-Y-L - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
Other uncommon English words near this rank
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.