noun Etymology: planet + -esimal (as in infinitesimal) Date: 1903 any of numerous small solid celestial bodies that may have existed at an early stage of the development of the solar system
PLANETESIMAL
Meaning of PLANETESIMAL in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012