posteroaxis

P3O1S1T1E1R1O1A1X8I1S1

noun

The posterior section of the central axial lobe on the pygidium of an agnostoid trilobite.

OriginEnglish axis ← Latin axis ← Proto-Italic *aksis →
Scrabble 20
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Meanings

nounposteroaxis (plural posteroaxes)

plural posteroaxes

  1. biologyThe posterior section of the central axial lobe on the pygidium of an agnostoid trilobite.

    […] isopygous trilobites having two thoracic segments, 2-3 segments in the pygidial anteroaxis, 3-8 additionally in fused complex posteroaxis of variable geometry and constitution[…]

    1990, J. H. Shergold, J. R. Laurie, Sun Xiaowen, Classification and Review of the Trilobite Order Agnostida Salter, 1864: An Australian Perspective, archived from the original on 26 Jul 2026, page 32

Origin

  1. Proto-Indo-European*pós
  2. Proto-Indo-European*pósti
  3. Proto-Italic*posti
  4. Proto-Italic*posteros
  5. Latinposterus
  6. Latinposterior
  7. Englishpostero-
  8. Proto-Indo-European*h₂eǵ-?
  9. Proto-Indo-European*h₂eḱs-
  10. Proto-Italic*aksis
  11. Latinaxis
  12. Englishaxis
  13. Englishposteroaxis

From postero- + axis.

Full word history & related roots →
Cite this entry
APA

posteroaxis. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/posteroaxis

MLA

“posteroaxis.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/posteroaxis. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “posteroaxis,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/posteroaxis.

Source: posteroaxis on Wiktionary, CC BY-SA 4.0.