protogenic1
/ˌprəʊtə(ʊ)ˈdʒɛnɪk/adjective
Original, primary; of or belonging to the first or earliest stage.
Origin
Mid 19th century; earliest use found in George Edward Day (1815–1872), physician. Irregularly from ancient Greek πρωτογενής first-born, primeval + -ic.
protogenic2
/ˌprəʊtə(ʊ)ˈdʒɛnɪk/Chemistry
adjective
Of a substance, molecular species, etc.: able to supply a hydrogen atom for protonation; proton-donating; = protic. Opposed to protophilic.
Origin
1930s; earliest use found in Journal of the American Chemical Society. From proto- + -genic. Compare German protogen, adjective.