ecology:  Interpreted literally, ecology means ‘study of houses’. The word was coined, as ökologie, by the German zoologist Ernst Haeckel in the 1870s, on the basis of Greek oikos (as in economy). This means literally ‘house’, but Haeckel was using it in the wider sense ‘dwelling, habitat’. English adopted the word soon after its coinage, originally in the quasi- Latin form oecology. => economy
1873, oecology, "branch of science dealing with the relationship of living things to their environments," coined in German by German zoologist Ernst Haeckel (1834-1919) as Ökologie, from Greek oikos "house, dwelling place, habitation" (see villa) + -logia "study of" (see -logy). In use with reference to anti-pollution activities from 1960s.