[1850–55; hippo- + -logy]This word is first recorded in the period 1850–55. Other words that entered Englishat around the same time include: clear-cut, ethylene, muggins, runoff, segue-logy is a combining form used in the names of sciences or bodies of knowledge. Other wordsthat use the affix -logy include: anthropology, chronology, ethnology, methodology, tropology