acute (English)

Where does "acute" come from?

The English word 'acute' descends from the Latin 'acutus', which is the perfect passive participle of the verb 'acuō' meaning to sharpen or to make pointed[1][4]. The ultimate root of this word is the Proto-Indo-European '*h₂eḱus' meaning pointed[3]. By the time it entered Late Middle English as 'acute', the term carried meanings related to sudden diseases, sharp humours, and high pitched musical notes[1]. It remains a doublet of the word 'ague', which once referred to an acute, intermittent fever. The term reflects a long evolution from the Latin noun 'acus' meaning a needle or pin, which itself shares a common ancestry with the primary root '*h₂eḱ-' indicating sharpness[1][2][3].

Open questions

While some scholars trace the noun 'acus' directly to the Proto-Indo-European root, other linguists argue it was a later formation derived from that same root. [3]
The classification of the Latin term 'acus' as a u-stem adjective at the time of its derivation remains a subject of investigation. [2]

Full etymology tree

acute (English), 'Brief, quick, short.'
- inherited acute (Middle English)
  - borrowed acuta (Latin), 'inflection of acūtus:'
    - inherited acutus (Latin), 'sharpened, made sharp, sharp, having been sharpened'
      - deverbal acuo (Latin), 'to make pointed, sharpen, whet'
        derived acus (Latin), 'a needle, a pin'
        derived *h₂eḱ- (Proto-Indo-European), 'sharp'

Ancestors

*h₂eḱ- (Proto-Indo-European)
acuta (Latin)

Cognates and doublets

ague (English)

Descendants and derived words

cute (English)
accent acute (English)
acuity (English)
acutance (English)
acutangular (English)
acute abdo (English)
acute abdomen (English)
acute accent (English)
acute angle (English)
acute-angled (English)
acute-angled triangle (English)
acute aortic syndrome (English)

Sources

Updated August 2026

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Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris