MTD
"mtd" is a 3-letter English headword indexed on PlainSpell.
The verdict
“MTD” is uncommon English (frequency #79,772 among 36,575 “M” headwords), classed as a noun. The kind of spelling people second-guess.
- #79,772
- frequency rank, English
- 36,575
- “M” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of maximum tolerated dose.
| Property | Value |
|---|---|
| Headword | MTD |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #79,772 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “MTD” sits in English frequency
Rare enough to double-check
MTD is uncommon English at frequency #79,772 among 36,575 “M” headwords, classed as anoun. Rarity is why readers land here mid-draft. 2 senses are on record.
MTD doesn't appear in our generated misspelling index, and the word's spelling is regular enough that our generator found nothing worth flagging. No close-neighbour confusable shows up for this headword in our dataset, since its spelling is unusual enough that it doesn't cluster with a lookalike.
This entry carries no recorded etymology, so its spelling is best explained by sound-to-letter mapping rather than etymology. The correct English form is MTD, spelled M-T-D.
Definition
- 1Initialism of maximum tolerated dose.
- 2Initialism of moralistic therapeutic deism.
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 “MTD”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is M-T-D - 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.