bacterium

/bækˈtɪəɹ.ɪəm/

//bækˈtɪəɹ.ɪəm// noun

"bacterium" is a 9-letter English headword indexed on PlainSpell.

The verdict

“bacterium” has 13 generated spelling variants in the English index at frequency #27,064. The variants make it a useful spelling check.

#27,064
frequency rank, English
4,121
“B” headwords
13
tracked misspellings
2
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A single-celled organism with cell walls but no nucleus or organelles.

Corpus desk

Index EN-bacterium · bacterium · English

bacterium · rank #27,064 · 13 variants · 2 confusables

  • FREQ-MID #27,064
  • LEN-LONG 9 letters
  • VOW-4 4 vowels
  • CONFUS-LOW 2 pairs
  • VAR-HIGH 13 variants
  • BOOK-MID 4,121
  • PHOTO-FINISH azalea

Nearest frequency peer: azalea (-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 “bacterium”

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

corpus weight

What this shows “bacterium” 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).

bacterium vs bacteria
78% similar
bacterium vs bacterial
78% similar

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

Key facts for bacterium
PropertyValue
Headwordbacterium
LanguageEnglish
Part of speechNoun
IPA/bækˈtɪəɹ.ɪəm/
Letters9
Frequency rank#27,064
Misspellings tracked13
Confusable pairs2
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “bacterium”

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

#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. Same rarity band neighbours include “azalea” (#27,063), “Balochistan” (#27,065), “Ayrshire” (#27,062). Among 4,121 “B” headwords, “bacterium” is #27,064. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 13 spelling variants around bacterium (IPA /bækˈtɪəɹ.ɪəm/), anoun. Corpus frequency is #27,064 among 4,121 “B” headwords. Dominant gloss: "A single-celled organism with cell walls but no nucleus or organelles.".

Our generated misspelling index lists 13 likely wrong-spelling variants for bacterium, with forms such as "abcterium", "baccterium", and "bacetrium". 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 2 confusable-pair relationships, "bacteria", "bacterial", a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: From New Latin bactērium, from Ancient Greek βακτήριον (baktḗrion, “small staff”), from βακτηρία (baktēría). The correct English form is bacterium, spelled B-A-C-T-E-R-I-U-M.

Definition

  1. 1
    A single-celled organism with cell walls but no nucleus or organelles.

Recorded use

Wiktionary example

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

  1. Plastics are energy-rich substances, which is why many of them burn so readily. Any organism that could unlock and use that energy would do well in the Anthropocene. Terrestrial bacteria and fungi which can manage this trick are already familiar to experts in the field.

Etymology

From New Latin bactērium, from Ancient Greek βακτήριον (baktḗrion, “small staff”), from βακτηρία (baktēría).

Synonyms

This word in other languages

Common misspellings

Also misspelled as:

  • abcterium
  • baccterium
  • bacetrium
  • bacteirum
  • bacterimu
  • bacteriumm
  • bacterrium
  • bacteruim
  • bactreium
  • bactterium
  • batcerium
  • bbacterium
  • bcaterium

Misspelling Pattern Breakdown

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

abcterium2baccterium1bacetrium2bacteirum2bacterimu2bacteriumm1bacterrium1bacteruim2
Edit distance from "bacterium"

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 "bacterium"?
"bacterium" is spelled B-A-C-T-E-R-I-U-M. The IPA pronunciation is /bækˈtɪəɹ.ɪəm/.
What does "bacterium" mean?
As a noun, "bacterium" means: A single-celled organism with cell walls but no nucleus or organelles.
What words are commonly confused with "bacterium"?
"bacterium" is commonly confused with "bacteria", "bacterial". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "bacterium"?
The IPA (International Phonetic Alphabet) transcription for "bacterium" is /bækˈtɪəɹ.ɪəm/. 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 "bacterium"?
From New Latin bactērium, from Ancient Greek βακτήριον (baktḗrion, “small staff”), from βακτηρία (baktēría). 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 "bacterium", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 9 letters (nearest by frequency rank).

Similar misspelling depth

Headwords with a similar count of attested misspellings (13 here; floor ≥5).

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

Source: FrequencyWords open word-frequency list