Archi-

CIDE DICTIONARY

Archi-,  [L., archi-, Gr. 'archi-, a prefix which is from the same root as 'a`rchein to be first, to begin; 'archh the first place, beginning; 'archo`s 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]