radium

/ˈɹeɪ.dɪ.əm/

//ˈɹeɪ.dɪ.əm// noun

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

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

The verdict

“radium” has 8 generated spelling variants in the English index at frequency #37,184. The variants make it a useful spelling check.

#37,184
frequency rank, English
3,094
“R” headwords
8
tracked misspellings
6
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The chemical element (symbol Ra) with an atomic number of 88. It is a soft, shiny and silvery radioactive alkaline earth metal.

Corpus desk

Index EN-radium · radium · English

radium · rank #37,184 · 8 variants · 6 confusables

  • FREQ-MID #37,184
  • LEN-LONG 6 letters
  • VOW-3 3 vowels
  • CONFUS-MID 6 pairs
  • VAR-MID 8 variants
  • BOOK-MID 3,094
  • PHOTO-FINISH ramming

Nearest frequency peer: ramming (+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.

Rank peers near misspelling magnet “radium”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “radium” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

radium vs Rahim
50% similar
radium vs radius
83% similar
radium vs radio
67% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for radium
PropertyValue
Headwordradium
LanguageEnglish
Part of speechNoun
IPA/ˈɹeɪ.dɪ.əm/
Letters6
Frequency rank#37,184
Misspellings tracked8
Confusable pairs6
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “radium”

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).radiumlands here:

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

The axis is logarithmic, with each marked tick roughly ten times rarer than the last. Same rarity band neighbours include “ramming” (#37,185), “rancid” (#37,186), “reassess” (#37,187). Among 3,094 “R” headwords, “radium” is #37,184. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 8 spelling variants around radium (IPA /ˈɹeɪ.dɪ.əm/), anoun. Corpus frequency is #37,184 among 3,094 “R” headwords. Wiktionary lists 2 senses, so context still picks the gloss.

Our generated misspelling index lists 8 likely wrong-spelling variants for radium, with forms such as "ardium", "raddium", and "radimu". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 6 confusable-pair relationships, "Rahim", "radius", "radio", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: Borrowed from French radium, from rad(ioactif) (“radioactive”) + -ium (suffix used to form the names of metallic elements). The correct English form is radium, spelled R-A-D-I-U-M.

Definition

  1. 1
    The chemical element (symbol Ra) with an atomic number of 88. It is a soft, shiny and silvery radioactive alkaline earth metal.
  2. 2
    A type of cloth woven from silk or synthetic yarn, often with a shiny appearance.

Recorded use

Wiktionary examples

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

  1. Madame [Marie] Curie, working with her distinguished husband, isolated and first traced to its true origin the source of the marvellous power which has thus commenced to revolutionise our philosophy of physics. This new element has appropriately been named "Radium;" but it has also been shown that there are many other, though less powerful, radio-active e…
  2. The persistence of radio-activity on glass vessels which have contained radium is remarkable. Filters, beakers, and dishes used in the laboratory for operations with radium, after having been washed in the usual way, remain radio-active: a piece of blende screen held inside the beaker or other vessel immediately glowing with the presence of radium.

Etymology

Borrowed from French radium, from rad(ioactif) (“radioactive”) + -ium (suffix used to form the names of metallic elements).

This word in other languages

radio(Español)radium(Français)Radium(Deutsch)rádio(Português)

Common misspellings

Also misspelled as:

  • ardium
  • raddium
  • radimu
  • radiumm
  • raduim
  • raidum
  • rdaium
  • rradium

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of radium - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.

ardium2raddium1radimu2radiumm1raduim2raidum2rdaium2rradium1
Edit distance from "radium"

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 "radium"?
"radium" is spelled R-A-D-I-U-M. The IPA pronunciation is /ˈɹeɪ.dɪ.əm/.
What does "radium" mean?
As a noun, "radium" means: The chemical element (symbol Ra) with an atomic number of 88. It is a soft, shiny and silvery radioactive alkaline earth metal.
What words are commonly confused with "radium"?
"radium" is commonly confused with "Rahim", "radius", "radio". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "radium"?
The IPA (International Phonetic Alphabet) transcription for "radium" is /ˈɹeɪ.dɪ.əm/. 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 "radium"?
Borrowed from French radium, from rad(ioactif) (“radioactive”) + -ium (suffix used to form the names of metallic elements). 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 "radium", not the corpus desk frequency band.

Same letter count

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

rancid#37,186Sayers#37,214sculpt#37,217patted#37,148

Similar misspelling depth

Headwords with a similar count of attested misspellings (8 here; floor ≥5).

reassess8 variantsprong8 variantspaloma8 variantsPacino8 variants

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

Source: FrequencyWords open word-frequency list