[plan.et.ol.o.gy] n, pl -gies (1907): a branch of astronomy that deals with the condensed matter of the solar system and esp. with the planets and their moons -- plan.et.o.log.i.cal adj -- plan.et.ol.o.gist n
PLANETOLOGY
Meaning of PLANETOLOGY in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012