[1650–60; ‹ Gk genethliālogía casting of destinies, equiv. to genethliā- (comb. form of genéthlē birth) + -logia -logy]This word is first recorded in the period 1650–60. Other words that entered Englishat around the same time include: gas, parade, pony, siphon, syllabus-logy is a combining form used in the names of sciences or bodies of knowledge. Other wordsthat use the affix -logy include: geology, methodology, topology, tropology, typology