"morena" meaning in Basque

{
  "categories": [
    {
      "kind": "other",
      "name": "Noms communs en basque",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en catalan",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Basque",
      "orig": "basque",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "(Date à préciser) De l'espagnol morena, issu du latin muraena (« anguille, lamproie »), lui-même issu du grec ancien σμύραινα (« anguille »)."
  ],
  "lang": "Basque",
  "lang_code": "eu",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Poissons en basque",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Murène."
      ],
      "id": "fr-morena-eu-noun-mZ2Mxy7B",
      "topics": [
        "ichthyology"
      ]
    }
  ],
  "word": "morena"
}

{
  "categories": [
    "Noms communs en basque",
    "Noms communs en catalan",
    "basque"
  ],
  "etymology_texts": [
    "(Date à préciser) De l'espagnol morena, issu du latin muraena (« anguille, lamproie »), lui-même issu du grec ancien σμύραινα (« anguille »)."
  ],
  "lang": "Basque",
  "lang_code": "eu",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Poissons en basque"
      ],
      "glosses": [
        "Murène."
      ],
      "topics": [
        "ichthyology"
      ]
    }
  ],
  "word": "morena"
}