A lot vs. Alot: 9 Grammatical Pitfalls
only recorded in classical Latin in extraordinarius, but much used in Medieval Latin and modern formations; it represents Latin extra (adv.) "on the outside, without, except," the old fem. ablative singular of exterus "outward, outside," comparative of ex "out of" (see ex-).
extra- or extro-
Outside; beyond: extracellular.