"poseido-" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "Ποσειδῶν"
      },
      "expansion": "Ancient Greek Ποσειδῶν (Poseidôn)",
      "name": "bor"
    }
  ],
  "etymology_text": "From Ancient Greek Ποσειδῶν (Poseidôn).",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prefix",
        "head": "",
        "sort": ""
      },
      "expansion": "poseido-",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "poseido-",
      "name": "en-prefix"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "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"
        }
      ],
      "derived": [
        {
          "word": "poseidocentric"
        }
      ],
      "glosses": [
        "Relating to Neptune"
      ],
      "id": "en-poseido--en-prefix-xrAmTSl-",
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "Neptune",
          "Neptune"
        ]
      ],
      "raw_glosses": [
        "(astronomy) Relating to Neptune"
      ],
      "related": [
        {
          "english": "the Sun",
          "word": "helio-"
        },
        {
          "english": "Mercury",
          "word": "hermeo-"
        },
        {
          "english": "Venus",
          "word": "cythero-"
        },
        {
          "english": "the Earth",
          "word": "geo-"
        },
        {
          "english": "the Moon",
          "word": "seleno-"
        },
        {
          "english": "Mars",
          "word": "areo-"
        },
        {
          "english": "Jupiter",
          "word": "zeno-"
        },
        {
          "english": "Saturn",
          "word": "crono-"
        },
        {
          "english": "Uranus",
          "word": "urano-"
        },
        {
          "alt": "Pluto",
          "word": "hadeo-"
        }
      ],
      "synonyms": [
        {
          "word": "neptuni-"
        }
      ],
      "tags": [
        "morpheme"
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ],
      "translations": [
        {
          "code": "fr",
          "lang": "French",
          "sense": "Translations",
          "word": "poséido-"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "Translations",
          "word": "poseido-"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "posejdo-",
          "sense": "Translations",
          "word": "посейдо-"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/pəˈsaɪ.doʊ/",
      "tags": [
        "US"
      ]
    }
  ],
  "word": "poseido-"
}

{
  "derived": [
    {
      "word": "poseidocentric"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "Ποσειδῶν"
      },
      "expansion": "Ancient Greek Ποσειδῶν (Poseidôn)",
      "name": "bor"
    }
  ],
  "etymology_text": "From Ancient Greek Ποσειδῶν (Poseidôn).",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prefix",
        "head": "",
        "sort": ""
      },
      "expansion": "poseido-",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "poseido-",
      "name": "en-prefix"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "related": [
    {
      "english": "the Sun",
      "word": "helio-"
    },
    {
      "english": "Mercury",
      "word": "hermeo-"
    },
    {
      "english": "Venus",
      "word": "cythero-"
    },
    {
      "english": "the Earth",
      "word": "geo-"
    },
    {
      "english": "the Moon",
      "word": "seleno-"
    },
    {
      "english": "Mars",
      "word": "areo-"
    },
    {
      "english": "Jupiter",
      "word": "zeno-"
    },
    {
      "english": "Saturn",
      "word": "crono-"
    },
    {
      "english": "Uranus",
      "word": "urano-"
    },
    {
      "alt": "Pluto",
      "word": "hadeo-"
    }
  ],
  "senses": [
    {
      "categories": [
        "English 3-syllable words",
        "English entries with incorrect language header",
        "English lemmas",
        "English prefixes",
        "English terms borrowed from Ancient Greek",
        "English terms derived from Ancient Greek",
        "English terms with IPA pronunciation",
        "Translation table header lacks gloss",
        "en:Astronomy"
      ],
      "glosses": [
        "Relating to Neptune"
      ],
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "Neptune",
          "Neptune"
        ]
      ],
      "raw_glosses": [
        "(astronomy) Relating to Neptune"
      ],
      "synonyms": [
        {
          "word": "neptuni-"
        }
      ],
      "tags": [
        "morpheme"
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/pəˈsaɪ.doʊ/",
      "tags": [
        "US"
      ]
    }
  ],
  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "sense": "Translations",
      "word": "poséido-"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "Translations",
      "word": "poseido-"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "posejdo-",
      "sense": "Translations",
      "word": "посейдо-"
    }
  ],
  "word": "poseido-"
}