"preplanetary nebula" meaning in English

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  "etymology_text": "From pre- + planetary nebula.",
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        "A stage in stellar evolution when a star starts to shed its outer layers before coming a true planetary nebula."
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        "(astronomy) A stage in stellar evolution when a star starts to shed its outer layers before coming a true planetary nebula."
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        "(astronomy) A stage in stellar evolution when a star starts to shed its outer layers before coming a true planetary nebula."
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