Word.ws English Dictionary

octodecimal

octodecimal adjective: having eight times ten faces.

Adjective

octodecimal (not comparable)

  1. (crystals) Having eight times ten faces.
  2. Using eighteen as the base.
    • Octodecimal 1249 is equivalent to decimal 6561 or nonary 10000.
    • The decimal scheme should have been made a duodecimal, or better a quinquedecimal or octodecimal one; the expansive system would need a more than India-rubber elasticity to include all the whimsical creations of an author's brain.1907, The Dial - Volume 43, page 411
  3. Pertaining to eighteen.
    • I say very considerably greater than, because only a certain number of the terms which satisfy the required conditions of order and weight actually appear in the octodecimal invariant in question.1879, The Messenger of Mathematics, page 7
    • 18 modes of archery and use of other implements of war (Adavuyal and Ayudhet prayogangal), 18 kinds of manners and customs (Nattacharangal) and there seems to be something of importance in this octodecimal division.1950, Ramananda Chatterjee, The Modern Review - Volume 87, page 404

Examples of octodecimal in a sentence

  • it is reasonable to suppose that a warmer temperature will be manifest as from the octodecimal apex 1957-58, and will subsequently continue.1951, Inter-African Bureau for Soils and Rural Economy, African Soils - Volumes 1-3, page 107:
  • Hermite's octodecimal invariant of a binary quintic, which will change its sign with that of the determinant of transformation.1973, James Joseph Sylvester, 1854-1973, page 387:
  • Hermite to state, took its rise in that great analyst's discovery of the octodecimal invariant of the binary quintic.2012, James Joseph Sylvester, H. F. Baker, The Collected Mathematical Papers of James Joseph Sylvester:

Origin of octodecimal

From octo- + decimal.

Questions about octodecimal

What does octodecimal mean?
Octodecimal means having eight times ten faces.
How do you use octodecimal in a sentence?
it is reasonable to suppose that a warmer temperature will be manifest as from the octodecimal apex 1957-58, and will subsequently continue.
What part of speech is octodecimal?
Octodecimal is an adjective.

Words near octodecimal in the dictionary

  1. octodactylous
  2. octode
  3. octodecanoid
  4. octodecillion
  5. octodecillions
  6. octodecimal
  7. octodecimo
  8. octodecimos
  9. octodentate
  10. octodes
  11. octodont

Source and license

Adapted from Wiktionary: octodecimal (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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