Definition of "hex-" in English

prefix

1. Alternative form of hexa-, usually used before a vowel.

2. (chemistry) Used for the digit six 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”) + hex- (“6”) + -ium (element suffix) → unbihexium (“element 126”)