EDIT: Below posted before the posting to which is was a response was edited to reflect this fact:
Actually, focus is a noun in English:
And here, they also give both "foci" and "focuses" as plurals. Webster. Meh.
SR #265 | "Quia currus certatus, inferius"
13 Focus Ti Sedan w/Handling Pkg, MFT Sony 10 NAV, Leather
13 Focus SE HB Sterling Grey, 201A, Leather
06 F350 6.0L DRW King Ranch, Sunroof, Rhino Bed Liner, 4" MBRP Turbo Back, AirRaid, Edge Chip w/Pyro