"secondary planet" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "secondary",
        "3": "planet"
      },
      "expansion": "secondary + planet",
      "name": "compound"
    }
  ],
  "etymology_text": "From 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": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "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": "From 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",
        "Pages with 1 entry",
        "Pages with entries",
        "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"
}