Etymograph

English

aculeiform

Aculeiform comes from Latin aculeus ‘thorn’, from acus ‘needle’, and ultimately from Proto-Indo-European *h₂eḱ- ‘sharp’.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*h₂eḱ-1‘sharp’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*h₂eḱus1‘pointed’reconstructed
  3. Latinc. 75 BCE–200 CEacus2‘needle’
  4. Latinc. 75 BCE–200 CEaculeus3‘thorn’
  5. Englishtodayaculeiform3

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Latin acus
  2. 2 Wiktionary, Latin aculeus
  3. 3 Wiktionary, English aculeiform

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*h₂eḱ-Wiktionary, Latin acus‘sharp’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*h₂eḱusWiktionary, Latin acus‘pointed’reconstructed
  3. Latinc. 75 BCE–200 CEacusWiktionary, Latin aculeus‘needle’
  4. Latinc. 75 BCE–200 CEaculeusWiktionary, English aculeiform‘thorn’
  5. EnglishtodayaculeiformWiktionary, English aculeiform

Formed from iform

Linked words

through Proto-Indo-European *h₂eḱ- ‘sharp’

hear, edge, egg, ear, acid, hammer, eager, axe, oxide, vinegar, mediocre, acne, mediocrity, paragon, acetate, acacia, hark, exacerbate, acme, acumen, acuity, acyl, rosacea, acrimony, acrid, acerbic, exacerbation, roselle, 71 more

through Latin acus ‘needle’

acute, acupuncture, 17 more

Today it means

adj Like a prickle or thorn

Sources

Sources: Wiktionary, “aculeiform”; the older steps come from the Wiktionary entries for Latin acus, Latin aculeus. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.

Etymograph / Proto-Indo-European *h₂eḱ- / aculeiform

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