I. prefix
Etymology: Middle English arche-, arch-, from Old English & Anglo-French; Old English arce-, from Late Latin arch- & Latin archi-; Anglo-French arch-, from Late Latin arch- & Latin archi-, from Greek arch-, archi-, from archein to begin, rule; akin to Greek archē beginning, rule, archos ruler
1. : chief : principal
arch fiend
2. : extreme : most fully embodying the qualities of the kind
arch conservative
II.
— see archi-