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There are 3 eighteen-letter words beginning with PROTOPLA

protoplanetary␣disc protoplanetary␣disk protoplanetesimals

3 definitions found

protoplanetary␣disc — n. (Astronomy) Alternative form of protoplanetary disk.
protoplanetary␣disk — n. (Astronomy) A rotating disk of dense gas and dust surrounding…
protoplanetesimals — n. Plural of protoplanetesimal.

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