oct-

prefix

Used for the digit eight to form systematic element names of elements whose existence has been predicted, and which have not yet been given a trivial name.

“un- (“1”) + bi- (“2”) + oct- (“8”) + -ium (element suffix) → unbioctium (“element 128”)”

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Meanings

prefix
  1. Form of octa- or octo- used before a vowel.
  2. chemistryUsed for the digit eight to form systematic element names of elements whose existence has been predicted, and which have not yet been given a trivial name.

    un- (“1”) + bi- (“2”) + oct- (“8”) + -ium (element suffix) → unbioctium (“element 128”)

Cite this entry
APA

oct-. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/oct-

MLA

“oct-.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/oct-. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “oct-,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/oct-.

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