"lucis" meaning in Latijn

{
  "categories": [
    {
      "kind": "other",
      "name": "Woorden in het Latijn",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Zelfstandig naamwoord in het Latijn",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Latijn",
  "lang_code": "la",
  "pos": "noun",
  "pos_title": "Zelfstandig naamwoord",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Zelfstandignaamwoordsvorm in het Latijn",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "lūcīs"
        }
      ],
      "glosses": [
        "genitief enkelvoud van lūx"
      ],
      "id": "nl-lucis-la-noun-6q5I8sUk",
      "tags": [
        "form-of"
      ]
    }
  ],
  "word": "lucis"
}

{
  "categories": [
    "Woorden in het Latijn",
    "Zelfstandig naamwoord in het Latijn"
  ],
  "lang": "Latijn",
  "lang_code": "la",
  "pos": "noun",
  "pos_title": "Zelfstandig naamwoord",
  "senses": [
    {
      "categories": [
        "Zelfstandignaamwoordsvorm in het Latijn"
      ],
      "form_of": [
        {
          "word": "lūcīs"
        }
      ],
      "glosses": [
        "genitief enkelvoud van lūx"
      ],
      "tags": [
        "form-of"
      ]
    }
  ],
  "word": "lucis"
}