"ἄνθρακα" meaning in Ancient Greek

{
  "forms": [
    {
      "form": "ánthraka",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "ἄνθρακα • (ánthraka) 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": "Ancient Greek terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "ánthrax",
          "word": "ἄνθραξ"
        }
      ],
      "glosses": [
        "accusative singular of ἄνθραξ (ánthrax)"
      ],
      "id": "en-ἄνθρακα-grc-noun-ogfKR573",
      "links": [
        [
          "ἄνθραξ",
          "ἄνθραξ#Ancient Greek"
        ]
      ],
      "tags": [
        "accusative",
        "form-of",
        "singular"
      ]
    }
  ],
  "word": "ἄνθρακα"
}

{
  "forms": [
    {
      "form": "ánthraka",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "ἄνθρακα • (ánthraka) 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",
        "Ancient Greek terms with redundant script codes"
      ],
      "form_of": [
        {
          "extra": "ánthrax",
          "word": "ἄνθραξ"
        }
      ],
      "glosses": [
        "accusative singular of ἄνθραξ (ánthrax)"
      ],
      "links": [
        [
          "ἄνθραξ",
          "ἄνθραξ#Ancient Greek"
        ]
      ],
      "tags": [
        "accusative",
        "form-of",
        "singular"
      ]
    }
  ],
  "word": "ἄνθρακα"
}