GNU Collaborative International Dictionary of English

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1.       
   Archi- . [L., archi-, Gr. ἀρχι-, a prefix which is from the same root as ἄρχειν to be first, to begin; ἀρχη the first place, beginning; ἀρχός chief. Cf. AS. arce-, erce-, OHG. erzi-, G. erz-.] A prefix signifying chief, arch; as, architect, archiepiscopal. In (Biol.) and (Anat.) it usually means primitive, original, ancestral; as, archipterygium, the primitive fin or wing.
   1913 Webster