Where does “exagramme” come from?

exagramme (English) comes from English exa-, from Ancient Greek ἕξ, from Proto-Hellenic hwéks, from Proto-Indo-European swéḱs — six.

Ancestry of “exagramme”, step by step

StepLanguageWordMeaning
1Englishexa-API; In the International System of Units and...
2Ancient Greekἕξsix
3Proto-Hellenichwékscardinal...
4Proto-Indo-Europeanswéḱssix
Every word from Proto-Indo-European swéḱs →Every word from Proto-Hellenic hwéks →Every word from Ancient Greek ἕξ →