The term 'Cultural Prefix' refers to a prefix that is used to describe a culture or cultural group. The two crossword solutions for this term are ETHNO (5 letters) and AGRI (4 letters). ETHNO is derived from the Greek word ethnos, which means people or nation, and is used to refer to a particular ethnic group or culture. AGRI is derived from the Latin word ager, which means field or land, and is used to refer to an agricultural society or culture.