radionuclide

noun

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

"radionuclide" is a 12-letter English headword indexed on PlainSpell.

The verdict

“radionuclide” is uncommon English (frequency #81,737 among 3,094 “R” headwords), classed as a noun. The kind of spelling people second-guess.

#81,737
frequency rank, English
3,094
“R” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - a radioactive nuclide

Corpus desk

Index EN-radionuclide · radionuclide · English

radionuclide · rank #81,737 · 0 variants · 0 confusables

  • FREQ-RARE #81,737
  • LEN-MEGA 12 letters
  • VOW-6 6 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 3,094
  • PHOTO-FINISH Radi

Nearest frequency peer: Radi (-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 “radionuclide”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

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

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for radionuclide
PropertyValue
Headwordradionuclide
LanguageEnglish
Part of speechNoun
Letters12
Frequency rank#81,737
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “radionuclide” in English

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (right).radionuclidefalls 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: “Radi” (#81,736), “raconteur” (#81,735), “quilty” (#81,734). Among 3,094 “R” headwords, “radionuclide” is #81,737. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

radionuclide is uncommon English at frequency #81,737 among 3,094 “R” headwords, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "a radioactive nuclide".

Our edit-distance generator produced no likely misspellings for radionuclide, a sign its spelling follows regular English conventions. Our confusable-pair dataset has no match for it, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.

Etymologically, the entry records: From radio- + nuclide. The correct English form is radionuclide, spelled R-A-D-I-O-N-U-C-L-I-D-E.

Definition

  1. 1
    a radioactive nuclide

Etymology

From radio- + nuclide.

Synonyms

radioisotope

This word in other languages

radionucléide(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 "radionuclide"?
"radionuclide" is spelled R-A-D-I-O-N-U-C-L-I-D-E.
What does "radionuclide" mean?
As a noun, "radionuclide" means: a radioactive nuclide
What is the origin of the word "radionuclide"?
From radio- + nuclide. 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 "radionuclide", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 12 letters (nearest by frequency rank).

prednisolone#81,716Romanization#81,779Scheherazade#81,799stubblefield#81,866

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

Source: FrequencyWords open word-frequency list