"ἄνθρακι" meaning in Ancient Greek

{
  "forms": [
    {
      "form": "ánthraki",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "ἄνθρακι • (ánthraki) m",
      "name": "grc-noun form"
    }
  ],
  "lang": "Ancient Greek",
  "lang_code": "grc",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ancient Greek 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"
        }
      ],
      "form_of": [
        {
          "extra": "ánthrax",
          "word": "ἄνθραξ"
        }
      ],
      "glosses": [
        "dative singular of ἄνθραξ (ánthrax)"
      ],
      "id": "en-ἄνθρακι-grc-noun-lej4pDKB",
      "links": [
        [
          "ἄνθραξ",
          "ἄνθραξ#Ancient_Greek"
        ]
      ],
      "tags": [
        "dative",
        "form-of",
        "singular"
      ]
    }
  ],
  "word": "ἄνθρακι"
}

{
  "forms": [
    {
      "form": "ánthraki",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "ἄνθρακι • (ánthraki) m",
      "name": "grc-noun form"
    }
  ],
  "lang": "Ancient Greek",
  "lang_code": "grc",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Ancient Greek entries with incorrect language header",
        "Ancient Greek non-lemma forms",
        "Ancient Greek noun forms",
        "Ancient Greek proparoxytone terms",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "form_of": [
        {
          "extra": "ánthrax",
          "word": "ἄνθραξ"
        }
      ],
      "glosses": [
        "dative singular of ἄνθραξ (ánthrax)"
      ],
      "links": [
        [
          "ἄνθραξ",
          "ἄνθραξ#Ancient_Greek"
        ]
      ],
      "tags": [
        "dative",
        "form-of",
        "singular"
      ]
    }
  ],
  "word": "ἄνθρακι"
}