geotechnics Syllabification: (ge·o·tech·nics)Pronunciation: /ˌjēōˈtekniks/Definition of geotechnics noun [treated as singular] the branch of civil engineering concerned with the study and modification of soil and rocks. Derivatives geotechnic adjective geotechnicalPronunciation: /-nikəl/ adjective geotechnics in other Oxford dictionaries Definition of geotechnics in the British & World English dictionary