"lac" meaning in Middle French

{
  "descendants": [
    {
      "lang": "French",
      "lang_code": "fr",
      "word": "lac"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "frm",
        "2": "fro",
        "3": "lac"
      },
      "expansion": "Old French lac",
      "name": "inh"
    },
    {
      "args": {
        "1": "frm",
        "2": "la",
        "3": "lacus",
        "t": "lake"
      },
      "expansion": "Latin lacus (“lake”)",
      "name": "der"
    },
    {
      "args": {
        "1": "frm",
        "2": "ine-pro",
        "3": "*lókus",
        "t": "lake, pool"
      },
      "expansion": "Proto-Indo-European *lókus (“lake, pool”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Old French lac, a replacement of earlier lai (“pit, trench, ditch, grave, mere, pond”). Generally inferred as a borrowing of Latin lacus (“lake”), from Proto-Indo-European *lókus (“lake, pool”).",
  "forms": [
    {
      "form": "lacs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "frm",
        "10": "{{{f}}}",
        "11": "",
        "12": "{{{f}}}s",
        "2": "noun",
        "3": "",
        "4": "",
        "5": "plural",
        "6": "lacs",
        "7": "",
        "8": "{{{pl2}}}",
        "9": "",
        "f1accel-form": "p",
        "g": "m",
        "head": "",
        "sort": ""
      },
      "expansion": "lac m (plural lacs)",
      "name": "head"
    },
    {
      "args": {
        "1": "m"
      },
      "expansion": "lac m (plural lacs)",
      "name": "frm-noun"
    }
  ],
  "lang": "Middle French",
  "lang_code": "frm",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "lake; pond"
      ],
      "id": "en-lac-frm-noun-XEAwXXoR",
      "links": [
        [
          "lake",
          "lake"
        ],
        [
          "pond",
          "pond"
        ]
      ],
      "tags": [
        "masculine"
      ]
    },
    {
      "categories": [
        {
          "_dis": "4 96",
          "kind": "other",
          "name": "Middle French entries with incorrect language header",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "8 92",
          "kind": "other",
          "langcode": "frm",
          "name": "Bodies of water",
          "orig": "frm:Bodies of water",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "40 60",
          "kind": "other",
          "langcode": "frm",
          "name": "Landforms",
          "orig": "frm:Landforms",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "pit (hole in the ground)"
      ],
      "id": "en-lac-frm-noun-pIFZdQjx",
      "links": [
        [
          "pit",
          "pit"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "lac"
}

{
  "categories": [
    "Middle French countable nouns",
    "Middle French entries with incorrect language header",
    "Middle French lemmas",
    "Middle French masculine nouns",
    "Middle French nouns",
    "Middle French terms derived from Latin",
    "Middle French terms derived from Old French",
    "Middle French terms derived from Proto-Indo-European",
    "Middle French terms inherited from Old French",
    "Pages with 18 entries",
    "Pages with entries",
    "Pages with language headings in the wrong order",
    "frm:Bodies of water",
    "frm:Landforms",
    "zza:Children",
    "zza:Male people"
  ],
  "descendants": [
    {
      "lang": "French",
      "lang_code": "fr",
      "word": "lac"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "frm",
        "2": "fro",
        "3": "lac"
      },
      "expansion": "Old French lac",
      "name": "inh"
    },
    {
      "args": {
        "1": "frm",
        "2": "la",
        "3": "lacus",
        "t": "lake"
      },
      "expansion": "Latin lacus (“lake”)",
      "name": "der"
    },
    {
      "args": {
        "1": "frm",
        "2": "ine-pro",
        "3": "*lókus",
        "t": "lake, pool"
      },
      "expansion": "Proto-Indo-European *lókus (“lake, pool”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Old French lac, a replacement of earlier lai (“pit, trench, ditch, grave, mere, pond”). Generally inferred as a borrowing of Latin lacus (“lake”), from Proto-Indo-European *lókus (“lake, pool”).",
  "forms": [
    {
      "form": "lacs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "frm",
        "10": "{{{f}}}",
        "11": "",
        "12": "{{{f}}}s",
        "2": "noun",
        "3": "",
        "4": "",
        "5": "plural",
        "6": "lacs",
        "7": "",
        "8": "{{{pl2}}}",
        "9": "",
        "f1accel-form": "p",
        "g": "m",
        "head": "",
        "sort": ""
      },
      "expansion": "lac m (plural lacs)",
      "name": "head"
    },
    {
      "args": {
        "1": "m"
      },
      "expansion": "lac m (plural lacs)",
      "name": "frm-noun"
    }
  ],
  "lang": "Middle French",
  "lang_code": "frm",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "lake; pond"
      ],
      "links": [
        [
          "lake",
          "lake"
        ],
        [
          "pond",
          "pond"
        ]
      ],
      "tags": [
        "masculine"
      ]
    },
    {
      "glosses": [
        "pit (hole in the ground)"
      ],
      "links": [
        [
          "pit",
          "pit"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "lac"
}