This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A collection of gas and dust in space with high temperature that usually grows to the point of beginning nuclear fusion and becoming a star.

"Since then, stars have formed by the collapse of small, dense core regions in large, cold protostar, which is hot and bright because of energy generated by gravitational contraction."

base/base    protoplanetary    erotomania    wind-blasted    stellate