'autogamic' originates from New Latin, specifically the word 'autogamicus', where Greek 'auto-' meant 'self' and Greek 'gamos' (through Latin/Neo-Latin formation) meant 'marriage' or 'union'.

'autogamic' changed from Neo-Latin 'autogamia' (from Greek elements 'autó-' + 'gámos' meaning 'self-marriage') into the English noun 'autogamy' in the 19th century, and the adjective form 'autogamic' developed from that noun.

Initially it referred literally to 'self-marriage' (a figurative compound meaning self-union), and over time the term came to be used specifically for biological self-fertilization/self-pollination; the adjectival form now means 'relating to self-fertilization or self-pollination'.