"secondary planet" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "secondary",
        "3": "planet"
      },
      "expansion": "secondary + planet",
      "name": "compound"
    }
  ],
  "etymology_text": "secondary + planet from being the planet of a planet (a satellite of a planet).",
  "forms": [
    {
      "form": "secondary planets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "secondary planet (plural secondary planets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Astronomy",
          "orig": "en:Astronomy",
          "parents": [
            "Sciences",
            "Space",
            "All topics",
            "Nature",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Moons",
          "orig": "en:Moons",
          "parents": [
            "Celestial bodies",
            "Space",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A moon of a planet."
      ],
      "hypernyms": [
        {
          "word": "satellite"
        },
        {
          "word": "moon"
        }
      ],
      "id": "en-secondary_planet-en-noun-bYHgzaty",
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "moon",
          "moon"
        ],
        [
          "planet",
          "planet"
        ]
      ],
      "raw_glosses": [
        "(astronomy, obsolete, archaic) A moon of a planet."
      ],
      "related": [
        {
          "word": "satellite planet"
        },
        {
          "word": "primary planet"
        },
        {
          "word": "planet"
        }
      ],
      "tags": [
        "archaic",
        "obsolete"
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ]
    }
  ],
  "word": "secondary planet"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "secondary",
        "3": "planet"
      },
      "expansion": "secondary + planet",
      "name": "compound"
    }
  ],
  "etymology_text": "secondary + planet from being the planet of a planet (a satellite of a planet).",
  "forms": [
    {
      "form": "secondary planets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "secondary planet (plural secondary planets)",
      "name": "en-noun"
    }
  ],
  "hypernyms": [
    {
      "word": "satellite"
    },
    {
      "word": "moon"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "satellite planet"
    },
    {
      "word": "primary planet"
    },
    {
      "word": "planet"
    }
  ],
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with archaic senses",
        "English terms with obsolete senses",
        "en:Astronomy",
        "en:Moons"
      ],
      "glosses": [
        "A moon of a planet."
      ],
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "moon",
          "moon"
        ],
        [
          "planet",
          "planet"
        ]
      ],
      "raw_glosses": [
        "(astronomy, obsolete, archaic) A moon of a planet."
      ],
      "tags": [
        "archaic",
        "obsolete"
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ]
    }
  ],
  "word": "secondary planet"
}