Meaning of oct- | Babel Free

Definitions

1. Form of octa- or octo- used before a vowel.
   form-of, morpheme
2. 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.
   morpheme

Examples

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

CEFR level