leptospirosis

noun

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

"leptospirosis" is a 13-letter English headword indexed on PlainSpell.

The verdict

“leptospirosis” is uncommon English (frequency #95,074 among 2,297 “L” headwords), classed as a noun. The kind of spelling people second-guess.

#95,074
frequency rank, English
2,297
“L” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - An acute, infectious, febrile disease of both humans and animals, caused by spirochetes of the genus Leptospira.

Corpus desk

Index EN-leptospirosis · leptospirosis · English

leptospirosis · rank #95,074 · 0 variants · 0 confusables

  • FREQ-RARE #95,074
  • LEN-MEGA 13 letters
  • VOW-5 5 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 2,297
  • PHOTO-FINISH lifeform

Nearest frequency peer: lifeform (+4 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 “leptospirosis”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

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

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for leptospirosis
PropertyValue
Headwordleptospirosis
LanguageEnglish
Part of speechNoun
Letters13
Frequency rank#95,074
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “leptospirosis” in English

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).leptospirosisfalls in this rarity band:

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

Scale is logarithmic (each tick is 10× rarer). Rare peers in the same band: “lifeform” (#95,078), “Ledyard” (#95,069), “Lilienthal” (#95,080). Among 2,297 “L” headwords, “leptospirosis” is #95,074. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

leptospirosis is uncommon English at frequency #95,074 among 2,297 “L” headwords, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "An acute, infectious, febrile disease of both humans and animals, caused by spirochetes of the genus Leptospira.".

leptospirosis doesn't appear in our generated misspelling index, suggesting the orthography follows predictable English patterns. Our confusable-pair dataset has no match for it, since no other headword is close enough in sound or shape to pair with it.

Etymologically, the entry records: From Leptospira + -osis. The correct English form is leptospirosis, spelled L-E-P-T-O-S-P-I-R-O-S-I-S.

Definition

  1. 1
    An acute, infectious, febrile disease of both humans and animals, caused by spirochetes of the genus Leptospira.

Etymology

From Leptospira + -osis.

Synonyms

Weil’s diseasecanicola fevercanefield fevernanukayami fever7-day feverrat catcher's yellowsFort Bragg feverblack jaundicepretibial feverrat fever

This word in other languages

leptospirose(Français)Leptospirose(Deutsch)leptospirose(Português)

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 "leptospirosis"?
"leptospirosis" is spelled L-E-P-T-O-S-P-I-R-O-S-I-S.
What does "leptospirosis" mean?
As a noun, "leptospirosis" means: An acute, infectious, febrile disease of both humans and animals, caused by spirochetes of the genus Leptospira.
What is the origin of the word "leptospirosis"?
From Leptospira + -osis. 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 "leptospirosis", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 13 letters (nearest by frequency rank).

irretrievable#95,004instantiation#94,994indispensible#94,990phospholipase#95,267

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

Source: FrequencyWords open word-frequency list