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“arch-” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

arch-
(as prefix =) (as prefix =) chief, (a) In dignities and titles archi- prefixed, as in Archbishop, Archiepiscopus: in other words (b), often by summus or maximus (with or without omnium): by (c) caput or princeps with genitive; or (d) by qui totus ex aliqua re factus est, or versatus in omni genere alicujus rei; or, lastly (in a few words in Plaut., and afterward in Juv.), by the Greek prefix tri-.. Thus, trifur, triscurria.

Quick answer

What is the Latin word for arch-?
The usual Latin words for “arch-” are archiepiscopus, superus, magnus; also caput, prī̆nceps, thūs. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.