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There are 12 words beginning with PROTOPLANET

protoplanet protoplanetary proto-planetary protoplanetary␣disc protoplanetary␣discs protoplanetary␣disk protoplanetary␣nebula protoplanetary␣nebulae protoplanetary␣nebulas protoplanetesimal protoplanetesimals protoplanets

protoplanet — n. An astronomical object, approximately the size of the Moon…
protoplanetary — adj. (Astronomy, planets) Of or pertaining to a protoplanet. — adj. Relating to a stage in the life of a red giant star or its…
proto-planetary — adj. Alternative form of protoplanetary.
protoplanetary␣disc — n. (Astronomy) Alternative form of protoplanetary disk.
protoplanetary␣discs — n. Plural of protoplanetary disc.
protoplanetary␣disk — n. (Astronomy) A rotating disk of dense gas and dust surrounding…
protoplanetary␣nebula — n. (Astronomy) A stage in stellar evolution when a star starts…
protoplanetary␣nebulae — n. Plural of protoplanetary nebula.
protoplanetary␣nebulas — n. Plural of protoplanetary nebula.
protoplanetesimal — n. A very small protoplanet. — adj. Synonym of protoplanetary.
protoplanetesimals — n. Plural of protoplanetesimal.
protoplanets — n. Plural of protoplanet.

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