mammalogy|mæˈmælədʒɪ| [irreg.f. Mammalia + -logy; after F. mammalogie.] The science of mammals. 1835Penny Cycl. III. 229/1 Fischer, the most recent writer upon mammalogy, enumerates eleven different species of baboons.1854Owen Skel. & Teeth in Circ.Sci., Organ. Nat. I. 301 The Systematic Mammalogies.