protoplanetary nebula

短语

词形变化

protoplanetary nebulae 复数 protoplanetary nebulae protoplanetary nebulas protoplanetary nebulas 复数

释义与例句

n.
  1. 1.

    A stage in stellar evolution when a star starts to shed its outer layers before coming a true planetary nebula.

    天文

词源

From proto- + planetary nebula.

来源：wiktionary