"Neptune grass" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "Neptune",
        "3": "grass",
        "tr1": "the Roman sea god, because it grows in the sea",
        "tr2": "from seagrass"
      },
      "expansion": "Neptune (the Roman sea god, because it grows in the sea) + grass (from seagrass)",
      "name": "com"
    }
  ],
  "etymology_text": "From Neptune (the Roman sea god, because it grows in the sea) + grass (from seagrass).",
  "forms": [
    {
      "form": "Neptune grasses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
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      "expansion": "Neptune grass (usually uncountable, plural Neptune grasses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
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          "parents": [],
          "source": "w"
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        {
          "kind": "other",
          "langcode": "en",
          "name": "Alismatales order plants",
          "orig": "en:Alismatales order plants",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Posidonia oceanica, a seagrass native to the Mediterranean."
      ],
      "id": "en-Neptune_grass-en-noun-xKRxcp-B",
      "tags": [
        "uncountable",
        "usually"
      ]
    }
  ],
  "sounds": [
    {
      "rhymes": "-æs"
    }
  ],
  "word": "Neptune grass"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "Neptune",
        "3": "grass",
        "tr1": "the Roman sea god, because it grows in the sea",
        "tr2": "from seagrass"
      },
      "expansion": "Neptune (the Roman sea god, because it grows in the sea) + grass (from seagrass)",
      "name": "com"
    }
  ],
  "etymology_text": "From Neptune (the Roman sea god, because it grows in the sea) + grass (from seagrass).",
  "forms": [
    {
      "form": "Neptune grasses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "+"
      },
      "expansion": "Neptune grass (usually uncountable, plural Neptune grasses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English compound terms",
        "English countable nouns",
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        "English nouns",
        "English uncountable nouns",
        "Entries using missing taxonomic name (species)",
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        "Rhymes:English/æs",
        "Rhymes:English/æs/3 syllables",
        "en:Alismatales order plants"
      ],
      "glosses": [
        "Posidonia oceanica, a seagrass native to the Mediterranean."
      ],
      "tags": [
        "uncountable",
        "usually"
      ]
    }
  ],
  "sounds": [
    {
      "rhymes": "-æs"
    }
  ],
  "word": "Neptune grass"
}