"mot souche" meaning in French

{
  "forms": [
    {
      "form": "mots souches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "mot souche m (plural mots souches)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Linguistics",
          "orig": "fr:Linguistics",
          "parents": [
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "root (word from which another word or words are derived)"
      ],
      "id": "en-mot_souche-fr-noun-mF65Amhp",
      "links": [
        [
          "linguistics",
          "linguistics"
        ],
        [
          "root",
          "root"
        ]
      ],
      "raw_glosses": [
        "(linguistics) root (word from which another word or words are derived)"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/mo suʃ/"
    }
  ],
  "word": "mot souche"
}

{
  "forms": [
    {
      "form": "mots souches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "mot souche m (plural mots souches)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French countable nouns",
        "French entries with incorrect language header",
        "French lemmas",
        "French masculine nouns",
        "French multiword terms",
        "French nouns",
        "French terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries",
        "fr:Linguistics"
      ],
      "glosses": [
        "root (word from which another word or words are derived)"
      ],
      "links": [
        [
          "linguistics",
          "linguistics"
        ],
        [
          "root",
          "root"
        ]
      ],
      "raw_glosses": [
        "(linguistics) root (word from which another word or words are derived)"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/mo suʃ/"
    }
  ],
  "word": "mot souche"
}