geoengineer noun 2verb 1forms 3 noun2 •Someone engaged in geoengineering (manipulation of Earth's habitats, especially to counter global warming). •An engineer whose speciality is geoengineering (geological engineering).Clearing up rock and fallen vegetation at such an awkward site required a team of specialist geoengineers. — 2020 verb1 •To produce by means of geoengineering. formsgeoengineered · geoengineering · geoengineers