"mers" meaning in Français

{
  "anagrams": [
    {
      "word": "rems"
    },
    {
      "word": "SERM"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "Formes de noms communs en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "mer",
      "tags": [
        "singular"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en français",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              129,
              133
            ]
          ],
          "ref": "revue La Brèche, 1961,nᵒ 1 à 8, page 44",
          "text": "C’est la longue vue, outil magique utilisant le principe de l’horizon qui déséclipse le bateau descendant derrière l’horizon des mers, comme déséclipsant l’avion ou l’oiseau disparus dans la voûte du ciel ou l’étoile enfouie dans la nuit."
        }
      ],
      "form_of": [
        {
          "word": "mer"
        }
      ],
      "glosses": [
        "Pluriel de mer."
      ],
      "id": "fr-mers-fr-noun-GJiDIISX"
    }
  ],
  "sounds": [
    {
      "ipa": "\\mɛʁ\\"
    },
    {
      "ipa": "\\mɛʁ\\"
    },
    {
      "ipa": "\\mɛʁ\\"
    },
    {
      "ipa": "\\meʁ\\"
    },
    {
      "audio": "LL-Q150 (fra)-Pamputt-mers.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/8/8e/LL-Q150_(fra)-Pamputt-mers.wav/LL-Q150_(fra)-Pamputt-mers.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/8/8e/LL-Q150_(fra)-Pamputt-mers.wav/LL-Q150_(fra)-Pamputt-mers.wav.ogg",
      "raw_tags": [
        "France (Brétigny-sur-Orge)"
      ],
      "wav_url": "https://commons.wikimedia.org/wiki/Special:FilePath/LL-Q150 (fra)-Pamputt-mers.wav"
    }
  ],
  "tags": [
    "feminine",
    "form-of"
  ],
  "word": "mers"
}

{
  "anagrams": [
    {
      "word": "rems"
    },
    {
      "word": "SERM"
    }
  ],
  "categories": [
    "Formes de noms communs en français",
    "français"
  ],
  "forms": [
    {
      "form": "mer",
      "tags": [
        "singular"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "categories": [
        "Exemples en français"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              129,
              133
            ]
          ],
          "ref": "revue La Brèche, 1961,nᵒ 1 à 8, page 44",
          "text": "C’est la longue vue, outil magique utilisant le principe de l’horizon qui déséclipse le bateau descendant derrière l’horizon des mers, comme déséclipsant l’avion ou l’oiseau disparus dans la voûte du ciel ou l’étoile enfouie dans la nuit."
        }
      ],
      "form_of": [
        {
          "word": "mer"
        }
      ],
      "glosses": [
        "Pluriel de mer."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\mɛʁ\\"
    },
    {
      "ipa": "\\mɛʁ\\"
    },
    {
      "ipa": "\\mɛʁ\\"
    },
    {
      "ipa": "\\meʁ\\"
    },
    {
      "audio": "LL-Q150 (fra)-Pamputt-mers.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/8/8e/LL-Q150_(fra)-Pamputt-mers.wav/LL-Q150_(fra)-Pamputt-mers.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/8/8e/LL-Q150_(fra)-Pamputt-mers.wav/LL-Q150_(fra)-Pamputt-mers.wav.ogg",
      "raw_tags": [
        "France (Brétigny-sur-Orge)"
      ],
      "wav_url": "https://commons.wikimedia.org/wiki/Special:FilePath/LL-Q150 (fra)-Pamputt-mers.wav"
    }
  ],
  "tags": [
    "feminine",
    "form-of"
  ],
  "word": "mers"
}