acidus

adj

The verdict

“acidus” is uncommon French (outside the top frequency list), classed as an adjective. The kind of spelling people second-guess.

Unranked
below top-frequency French
6
letters

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Aigre, acide.

Key facts for acidus
PropertyValue
Headwordacidus
LanguageFrench
Part of speechAdjective
Letters6
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “acidus” sits in French frequency

acidus falls outside the top-100,000 ranked French words, the long-tail zone of technical, archaic, or low-frequency vocabulary, exactly where readers second-guess spellings most.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

acidus is uncommon French outside the top frequency list, classed as anadjective. Rarity is why readers land here mid-draft. 2 senses are on record.

Our edit-distance generator produced no likely misspellings for acidus, suggesting the orthography follows predictable French patterns. We don't track a confusable pairing for this entry, suggesting its spelling stands apart enough that readers rarely confuse it with something else.

This entry's etymology isn't recorded, so its spelling is easiest explained by how it's pronounced rather than where it came from. The correct French form is acidus, spelled A-C-I-D-U-S.

Definition

  1. 1
    Aigre, acide.
  2. 2
    Désagréable, maussade, déplaisant.

Synonyms

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "acidus"?
"acidus" is spelled A-C-I-D-U-S.
What does "acidus" mean?
As an adjective, "acidus" means: Aigre, acide.
What language does "acidus" come from?
"acidus" is a French word. PlainSpell covers definitions, pronunciations, and spelling data across English, Spanish, Portuguese, French, and German.
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.

Using “acidus”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct French spelling is A-C-I-D-U-S - every other letter order is a misspelling in standard orthography.
  • Browse more French words and confusable pairs in the same reference. French words
Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

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

Source: FrequencyWords open word-frequency list