Definition of arch- in English:

arch-

Syllabification: arch-

combining form

1Chief; principal: archbishop
Synonyms
chief, principal, foremost, leading, main, major, prime, premier, greatest
informal number-one, numero uno
1.1Preeminent of its kind: archenemy
1.2(In unfavorable senses) out-and-out: arch-scoundrel

Origin

via Latin from Greek arkhi-, from arkhos 'chief'.

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Word of the day conspicuous
Pronunciation: kənˈspikyo͞oəs
adjective
standing out so as to be clearly visible