As a noun protoplanets is
.
planetisimal
Not English
Planetisimal has no English definition. It may be misspelled.
English words similar to 'planetisimal':
polyandrous,
plantations,
planetariums,
philanderers,
pollinators,
plentitudes,
plyometrics,
planetesimal,
planetesimals,
polyandrious,
polyanthous,
polyantheas,
palmitoylates,
plenteousness,
plentifulness,
polymyodous,
plaintiveness,
philanthropes,
polymatroidal,
planetessimal,
plantarflexes,
philanderess,
polyommatous,
palindromical,
planetoidal,
plunderings,
plantivorous
