THD

noun

By · According to Wiktionary data (CC BY-SA) ·

"thd" is a 3-letter English headword indexed on PlainSpell.

The verdict

“THD” is uncommon English (frequency #79,125 among 3,151 “T” headwords), classed as a noun. The kind of spelling people second-guess.

#79,125
frequency rank, English
3,151
“T” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of total harmonic distortion

Corpus desk

Index EN-thd · THD · English

THD · rank #79,125 · 0 variants · 0 confusables

  • FREQ-RARE #79,125
  • LEN-MID 3 letters
  • VOW-0 0 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 3,151
  • PHOTO-FINISH Theban

Nearest frequency peer: Theban (+1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Long-tail ranks near “THD”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

What this shows Long-tail view: where “THD” sits against similarly uncommon English ranks.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for THD
PropertyValue
HeadwordTHD
LanguageEnglish
Part of speechNoun
Letters3
Frequency rank#79,125
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “THD” in English

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).THDfalls in this rarity band:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Rare peers in the same band: “Theban” (#79,126), “Tessie” (#79,123), “Themis” (#79,127). Among 3,151 “T” headwords, “THD” is #79,125. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

THD is uncommon English at frequency #79,125 among 3,151 “T” headwords, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "Initialism of total harmonic distortion".

The misspelling generator found no plausible variants for THD, a sign its spelling follows regular English conventions. This headword has no recorded confusable partner, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.

Etymologically, the entry records: Abbreviation. The correct English form is THD, spelled T-H-D.

Definition

  1. 1
    Initialism of total harmonic distortion

Etymology

Abbreviation.

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

How do you spell "THD"?
"THD" is spelled T-H-D.
What does "THD" mean?
As a noun, "THD" means: Initialism of total harmonic distortion
What is the origin of the word "THD"?
Abbreviation. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "THD", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 3 letters (nearest by frequency rank).

TTR#79,153UEA#79,155vay#79,167veh#79,168

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list