triode

/ˈtɹaɪ.əʊd/

//ˈtɹaɪ.əʊd// noun

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

"triode" is a 6-letter English headword indexed on PlainSpell.

The verdict

“triode” is uncommon English (frequency #70,343 among 3,151 “T” headwords), classed as a noun. The kind of spelling people second-guess.

#70,343
frequency rank, English
3,151
“T” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A thermionic valve containing an anode, a cathode, and a control grid; small changes to the charge on the grid control the flow from cathode to anode, which makes amplification possible.

Corpus desk

Index EN-triode · triode · English

triode · rank #70,343 · 0 variants · 0 confusables

  • FREQ-RARE #70,343
  • LEN-LONG 6 letters
  • VOW-3 3 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 3,151
  • PHOTO-FINISH Troilus

Nearest frequency peer: Troilus (+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 “triode”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

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

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for triode
PropertyValue
Headwordtriode
LanguageEnglish
Part of speechNoun
IPA/ˈtɹaɪ.əʊd/
Letters6
Frequency rank#70,343
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “triode” 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).triodefalls in this rarity band:

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

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Rare peers in the same band: “Troilus” (#70,344), “Travancore” (#70,341), “Troyes” (#70,346). Among 3,151 “T” headwords, “triode” is #70,343. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

triode is uncommon English at frequency #70,343 among 3,151 “T” headwords, classed as anoun, transcribed /ˈtɹaɪ.əʊd/. Rarity is why readers land here mid-draft. Gloss: "A thermionic valve containing an anode, a cathode, and a control grid; small changes to the charge on the grid control the flow from cathode to anode, which makes amplification possible.".

No generated misspelling entries exist for triode in our index, since its letter pattern doesn't lend itself to common typo substitutions. Our confusable-pair dataset has no match for it, since nothing in our dataset looks or sounds close enough to cause mix-ups.

Etymologically, the entry records: Etymology tree Proto-Indo-European *tréyes Proto-Italic *trēs Latin trēsder. Latin tri-der. English tri- Proto-Indo-European *sed-der. Proto-Indo-European *sodós? Proto-Hellenic *hodós Ancient Greek ὁδός (hodós)bor. English -ode English triode From tri- + -… The correct English form is triode, spelled T-R-I-O-D-E.

Definition

  1. 1
    A thermionic valve containing an anode, a cathode, and a control grid; small changes to the charge on the grid control the flow from cathode to anode, which makes amplification possible.

Etymology

Etymology tree Proto-Indo-European *tréyes Proto-Italic *trēs Latin trēsder. Latin tri-der. English tri- Proto-Indo-European *sed-der. Proto-Indo-European *sodós? Proto-Hellenic *hodós Ancient Greek ὁδός (hodós)bor. English -ode English triode From tri- + -ode.

This word in other languages

triodo(Español)triode(Français)

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 "triode"?
"triode" is spelled T-R-I-O-D-E. The IPA pronunciation is /ˈtɹaɪ.əʊd/.
What does "triode" mean?
As a noun, "triode" means: A thermionic valve containing an anode, a cathode, and a control grid; small changes to the charge on the grid control the flow from cathode to anode, which makes amplification possible.
How do you pronounce "triode"?
The IPA (International Phonetic Alphabet) transcription for "triode" is /ˈtɹaɪ.əʊd/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "triode"?
Etymology tree Proto-Indo-European *tréyes Proto-Italic *trēs Latin trēsder. Latin tri-der. English tri- Proto-Indo-European *sed-der. Proto-Indo-European *sodós? Proto-Hellenic *hodós Ancient Greek ὁδός (hodós)bor. English -ode English triode Fro... 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 "triode", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 6 letters (nearest by frequency rank).

Troyes#70,346Totnes#70,338tsetse#70,348Tunney#70,351

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

Source: FrequencyWords open word-frequency list