"leuo-" meaning in Gaulois

{
  "categories": [
    {
      "kind": "other",
      "name": "Adjectifs en gaulois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots attestés en gaulois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Gaulois",
      "orig": "gaulois",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Mot attesté dans des noms de lieux dont Duroleuo, etc.^([1])^([2])."
  ],
  "lang": "Gaulois",
  "lang_code": "gaulois",
  "pos": "adj",
  "pos_title": "Adjectif",
  "senses": [
    {
      "glosses": [
        "Lisse, glissant, lent."
      ],
      "id": "fr-leuo--gaulois-adj-fLj1YpYR"
    }
  ],
  "word": "leuo-"
}

{
  "categories": [
    "Adjectifs en gaulois",
    "Mots attestés en gaulois",
    "gaulois"
  ],
  "etymology_texts": [
    "Mot attesté dans des noms de lieux dont Duroleuo, etc.^([1])^([2])."
  ],
  "lang": "Gaulois",
  "lang_code": "gaulois",
  "pos": "adj",
  "pos_title": "Adjectif",
  "senses": [
    {
      "glosses": [
        "Lisse, glissant, lent."
      ]
    }
  ],
  "word": "leuo-"
}