"gref" meaning in Ancien français

{
  "categories": [
    {
      "kind": "other",
      "name": "Adjectifs en ancien français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Ancien français",
      "orig": "ancien français",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "adj",
  "pos_title": "Adjectif",
  "senses": [
    {
      "alt_of": [
        {
          "word": "grief"
        }
      ],
      "glosses": [
        "Variante de grief."
      ],
      "id": "fr-gref-fro-adj-nB8VCmg4",
      "tags": [
        "alt-of"
      ]
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "gref"
}

{
  "categories": [
    "Adjectifs en ancien français",
    "ancien français"
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "adj",
  "pos_title": "Adjectif",
  "senses": [
    {
      "alt_of": [
        {
          "word": "grief"
        }
      ],
      "glosses": [
        "Variante de grief."
      ],
      "tags": [
        "alt-of"
      ]
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "gref"
}