PLANETARY NEBULA as NOUN

  1. Meaning
    • a nebula that was once thought to be a star with its planets but is now thought to be a very hot star surrounded by an expanding envelope of ionized gases that emit a fluorescent glow because of intense radiation from the star
    Hypernyms(s) planetary nebula is a kind of… Example: animal is a hypernym of mammal, plant is a hypernym of flower