Archi-
Archi- ({not transcribed})
[Latin, archi-, Greek '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. Compare Anglo-Saxon arce-, erce-, Old High German erzi-, German erz-.]
(Biology) A prefix signifying chief, arch; as, architect, archiepiscopal. In (Biology) and (Anatomy) it usually means primitive, original, ancestral; as, archipterygium, the primitive fin or wing.