Definition of arch- in English:

arch-

combining form

1.1Pre-eminent of its kind; out-and-out: arch-enemy

Origin

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

Definition of arch- in:

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Word of the day iconoclasm
Pronunciation: ʌɪˈkɒnəklaz(ə)m
noun
attacking or rejecting cherished beliefs or established values...