Meaning of ARCH- in English

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


— see archi-

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.