immunoassay

noun

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

"immunoassay" is a 11-letter English headword indexed on PlainSpell.

The verdict

“immunoassay” is uncommon English (frequency #93,824 among 2,140 “I” headwords), classed as a noun. The kind of spelling people second-guess.

#93,824
frequency rank, English
2,140
“I” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A test for the presence of a substance using the reaction of an antibody to its antigen, making use of the high selectivity of components of biological immune systems.

Corpus desk

Index EN-immunoassay · immunoassay · English

immunoassay · rank #93,824 · 0 variants · 0 confusables

  • FREQ-RARE #93,824
  • LEN-MEGA 11 letters
  • VOW-6 6 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 2,140
  • PHOTO-FINISH immediatly

Nearest frequency peer: immediatly (-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 neighbourhood for “immunoassay”

Lower corpus rank = more everyday usage (inverted bar length for readability)

corpus weight

What this shows Bars show where “immunoassay” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for immunoassay
PropertyValue
Headwordimmunoassay
LanguageEnglish
Part of speechNoun
Letters11
Frequency rank#93,824
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “immunoassay” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). immunoassay lands here:

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

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Rare enough to double-check

immunoassay is uncommon English at frequency #93,824 among 2,140 “I” headwords, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "A test for the presence of a substance using the reaction of an antibody to its antigen, making use of the high selectivity of components of biological immune systems.".

No generated misspelling entries exist for immunoassay in our index, a straightforward case of a spelling with little room for common typos. This headword has no recorded confusable partner, since its spelling is unusual enough that it doesn't cluster with a lookalike.

Etymologically, the entry records: From immuno- + assay. The correct English form is immunoassay, spelled I-M-M-U-N-O-A-S-S-A-Y.

Definition

  1. 1
    A test for the presence of a substance using the reaction of an antibody to its antigen, making use of the high selectivity of components of biological immune systems.

Recorded use

Wiktionary example

These source excerpts show how immunoassay appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. An over-the-counter, pee-on-a-stick pregnancy test is an immunoassay.

Etymology

From immuno- + assay.

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.

PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of September 3, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.

Frequently Asked Questions

How do you spell "immunoassay"?
"immunoassay" is spelled I-M-M-U-N-O-A-S-S-A-Y.
What does "immunoassay" mean?
As a noun, "immunoassay" means: A test for the presence of a substance using the reaction of an antibody to its antigen, making use of the high selectivity of components of biological immune systems.
What is the origin of the word "immunoassay"?
From immuno- + assay. 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 "immunoassay", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 11 letters (nearest by frequency rank).

infectivity#93,829Jabberwocky#93,849kitesurfing#93,879Lossiemouth#93,933

What to do next

You've looked up "immunoassay". Here's where to go from here.

  • Usage frequency rank #93,824 among English headwords in this corpus. Corpus statistics
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PlainSpell is a reference corpus, not spelling advice. Verify unusual forms in context.

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.

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

Source: FrequencyWords open word-frequency list