speculum

/ˈspɛk.jʊ.ləm/

//ˈspɛk.jʊ.ləm// noun

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

"speculum" is a 8-letter English headword indexed on PlainSpell.

The verdict

“speculum” is uncommon English (frequency #55,112 among 6,566 “S” headwords), classed as a noun. The kind of spelling people second-guess.

#55,112
frequency rank, English
6,566
“S” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A medical instrument used during an examination to dilate an orifice.

Corpus desk

Index EN-speculum · speculum · English

speculum · rank #55,112 · 0 variants · 0 confusables

  • FREQ-RARE #55,112
  • LEN-LONG 8 letters
  • VOW-3 3 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-DENSE 6,566
  • PHOTO-FINISH Sokoto

Nearest frequency peer: Sokoto (-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 “speculum”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

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

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for speculum
PropertyValue
Headwordspeculum
LanguageEnglish
Part of speechNoun
IPA/ˈspɛk.jʊ.ləm/
Letters8
Frequency rank#55,112
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “speculum” in English

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

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

The axis is logarithmic, with each marked tick roughly ten times rarer than the last. Rare peers in the same band: “Sokoto” (#55,111), “sociocultural” (#55,110), “smouldering” (#55,109). Among 6,566 “S” headwords, “speculum” is #55,112. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

speculum is uncommon English at frequency #55,112 among 6,566 “S” headwords, classed as anoun, transcribed /ˈspɛk.jʊ.ləm/. Rarity is why readers land here mid-draft. 4 senses are on record.

speculum doesn't appear in our generated misspelling index, typically a sign the spelling maps closely to how the word sounds. We don't track a confusable pairing for this entry, which tends to mean the word is visually distinctive enough to stand on its own.

Etymologically, the entry records: Learned borrowing from Latin speculum. The correct English form is speculum, spelled S-P-E-C-U-L-U-M.

Definition

  1. 1
    A medical instrument used during an examination to dilate an orifice.
  2. 2
    A mirror, especially one used in a telescope.
  3. 3
    A bright, lustrous patch of colour found on the wings of ducks and some other birds, usually situated on the distal portions of the secondary quills, and much more brilliant in the adult male than in the female.
  4. 4
    A lookout place.

Etymology

Learned borrowing from Latin speculum.

This word in other languages

espéculo(Español)spéculum(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 "speculum"?
"speculum" is spelled S-P-E-C-U-L-U-M. The IPA pronunciation is /ˈspɛk.jʊ.ləm/.
What does "speculum" mean?
As a noun, "speculum" means: A medical instrument used during an examination to dilate an orifice.
How do you pronounce "speculum"?
The IPA (International Phonetic Alphabet) transcription for "speculum" is /ˈspɛk.jʊ.ləm/. 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 "speculum"?
Learned borrowing from Latin speculum. 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 "speculum", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 8 letters (nearest by frequency rank).

stooping#55,121scrubber#55,086scimitar#55,085sciatica#55,084

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

Source: FrequencyWords open word-frequency list