1891 Century Dict. ,Sexadecimal. 
1905 Kamensky Mendeléeff'sPrinc. Chem. (ed. 3) I. 441 note,Sulphur is bivalent towards hydrogen, and sexavalent as regards oxygen. 
sexa-
Etymology
From Latin sex (“six”)
Prefix
| Latin number prefix | ||
| Previous: | quinque- | |
| Next: | septua- | |
or, before a vowel sex-
- six.
Synonyms
Derived terms
Category English words prefixed with sexa- not found