ICD
"icd" is a 3-letter English headword indexed on PlainSpell.
The verdict
“ICD” sits in 20 confusable pairs (corpus #34,926) as a noun. The look-alike neighbours are the real trap.
- #34,926
- frequency rank, English
- 2,140
- “I” headwords
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of implantable cardioverter-defibrillator.
Corpus desk
Index EN-icd · ICD · English
ICD · rank #34,926 · 0 variants · 20 confusables
- FREQ-MID #34,926
- LEN-MID 3 letters
- VOW-1 1 vowel
- CONFUS-HIGH 20 pairs
- VAR-0 0 variants
- BOOK-MID 2,140
- PHOTO-FINISH Ilya
Nearest frequency peer: Ilya (+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.
Frequency neighbours of confusable “ICD”
Peers at similar corpus weight, separate from look-alike pairs below
- horst
horst
65,079 corpus weight
- humping
humping
65,077 corpus weight
- ICD
ICD
65,075 corpus weight
- Ilya
Ilya
65,074 corpus weight
- immeasurable
immeasurable
65,073 corpus weight
- immorality
immorality
65,072 corpus weight
What this shows Bars place “ICD” against nearest ranked English headwords, not a reprint of the confusable-pair desk.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | ICD |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #34,926 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Corpus rank beside confusables of “ICD”
Easy to mix with look-alikes
The spelling risk for ICD is neighbouring look-alikes ("in", "is", …), not just typos; it is anoun. Frequency #34,926 among 2,140 “I” headwords. Gloss: "Initialism of implantable cardioverter-defibrillator.".
ICD doesn't appear in our generated misspelling index, typically a sign the spelling maps closely to how the word sounds. It also participates in 20 confusable-pair relationships, "in", "is", "it", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.
This entry carries no recorded etymology, so its spelling is best read as a straightforward mapping from sound to letter. The correct English form is ICD, spelled I-C-D.
Definition
- 1Initialism of implantable cardioverter-defibrillator.
Recorded use
Wiktionary examplesThese source excerpts show how ICD appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Both CRT-Ds and ICDs are implanted under the skin, in the patient’s upper chest area. The devices have wires called leads that attach to the heart and regulate the rhythm of the muscle. Defibrillators help patients with bradycardia – a slow heartbeat – by pacing the heartbeat and those with tachycardia – a fast heartbeat – by delivering shocks that reset…
Serie A club Inter Milan – whom Eriksen had been contracted to at the time of the incident – let the midfielder move abroad as he was unable to play in Italy unless the ICD device was removed.
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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Similar English words by spelling shape
Same letter count and similar misspelling depth for "ICD", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 letters (nearest by frequency rank).