"undercomma" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Lemmes en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en anglais de la typographie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "virgule souscrite."
      ],
      "id": "fr-undercomma-en-noun-zPZRJ~8k",
      "topics": [
        "typography"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈʌn.dɚ.ˌkɒm.a\\"
    }
  ],
  "synonyms": [
    {
      "word": "comma below"
    }
  ],
  "word": "undercomma"
}

{
  "categories": [
    "Lemmes en anglais",
    "Noms communs en anglais",
    "anglais"
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Lexique en anglais de la typographie"
      ],
      "glosses": [
        "virgule souscrite."
      ],
      "topics": [
        "typography"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈʌn.dɚ.ˌkɒm.a\\"
    }
  ],
  "synonyms": [
    {
      "word": "comma below"
    }
  ],
  "word": "undercomma"
}