OCA Meaning of OCA in English [ 'əʊkə ]■ noun a South American plant related to wood sorrel, cultivated in Peru for its edible tubers. [ Oxalis tuberosa .]OriginC17: from Amer. Sp., from Quechua ócca . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004