"Galilean moon" meaning in English

{
  "forms": [
    {
      "form": "Galilean moons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Galilean moon (plural Galilean moons)",
      "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": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Any of the four Galilean moons."
      ],
      "id": "en-Galilean_moon-en-noun-snhhikpv",
      "links": [
        [
          "Galilean moons",
          "Galilean moons"
        ]
      ],
      "synonyms": [
        {
          "word": "Galilean satellite"
        }
      ]
    }
  ],
  "word": "Galilean moon"
}

{
  "forms": [
    {
      "form": "Galilean moons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Galilean moon (plural Galilean moons)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys"
      ],
      "glosses": [
        "Any of the four Galilean moons."
      ],
      "links": [
        [
          "Galilean moons",
          "Galilean moons"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Galilean satellite"
    }
  ],
  "word": "Galilean moon"
}