"acardiac" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "ἀκάρδιος",
        "4": "",
        "5": "without a heart"
      },
      "expansion": "Ancient Greek ἀκάρδιος (akárdios, “without a heart”)",
      "name": "uder"
    },
    {
      "args": {
        "1": "en",
        "2": "",
        "3": "ac"
      },
      "expansion": "+ -ac",
      "name": "suffix"
    },
    {
      "args": {
        "1": "en",
        "2": "cardiac"
      },
      "expansion": "cardiac",
      "name": "m"
    }
  ],
  "etymology_text": "From Ancient Greek ἀκάρδιος (akárdios, “without a heart”) + -ac, after cardiac.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "acardiac (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -ac",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English undefined derivations",
          "parents": [
            "Undefined derivations",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Anatomy",
          "orig": "en:Anatomy",
          "parents": [
            "Biology",
            "Medicine",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Medicine",
          "orig": "en:Medicine",
          "parents": [
            "Biology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "acardiac twin"
        },
        {
          "word": "acardiac twinning"
        }
      ],
      "examples": [
        {
          "ref": "1831, Marshall Hall, A Critical and Experimental Essay on the Circulation of the Blood, page 76",
          "text": "The fact of a perfect circulation in acardiac fœtuses and acardiac animals, seems strongly to indicate an important influence in the arteries.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Lacking a heart."
      ],
      "id": "en-acardiac-en-adj-OWLRxqDE",
      "links": [
        [
          "medicine",
          "medicine"
        ],
        [
          "anatomy",
          "anatomy"
        ],
        [
          "heart",
          "heart"
        ]
      ],
      "raw_glosses": [
        "(medicine, anatomy) Lacking a heart."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "anatomy",
        "medicine",
        "sciences"
      ],
      "translations": [
        {
          "code": "pt",
          "lang": "Portuguese",
          "sense": "lacking a heart",
          "word": "acardíaco"
        }
      ]
    }
  ],
  "word": "acardiac"
}

{
  "derived": [
    {
      "word": "acardiac twin"
    },
    {
      "word": "acardiac twinning"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "ἀκάρδιος",
        "4": "",
        "5": "without a heart"
      },
      "expansion": "Ancient Greek ἀκάρδιος (akárdios, “without a heart”)",
      "name": "uder"
    },
    {
      "args": {
        "1": "en",
        "2": "",
        "3": "ac"
      },
      "expansion": "+ -ac",
      "name": "suffix"
    },
    {
      "args": {
        "1": "en",
        "2": "cardiac"
      },
      "expansion": "cardiac",
      "name": "m"
    }
  ],
  "etymology_text": "From Ancient Greek ἀκάρδιος (akárdios, “without a heart”) + -ac, after cardiac.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "acardiac (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms derived from Ancient Greek",
        "English terms suffixed with -ac",
        "English terms with quotations",
        "English uncomparable adjectives",
        "English undefined derivations",
        "en:Anatomy",
        "en:Medicine"
      ],
      "examples": [
        {
          "ref": "1831, Marshall Hall, A Critical and Experimental Essay on the Circulation of the Blood, page 76",
          "text": "The fact of a perfect circulation in acardiac fœtuses and acardiac animals, seems strongly to indicate an important influence in the arteries.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Lacking a heart."
      ],
      "links": [
        [
          "medicine",
          "medicine"
        ],
        [
          "anatomy",
          "anatomy"
        ],
        [
          "heart",
          "heart"
        ]
      ],
      "raw_glosses": [
        "(medicine, anatomy) Lacking a heart."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "anatomy",
        "medicine",
        "sciences"
      ]
    }
  ],
  "translations": [
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "lacking a heart",
      "word": "acardíaco"
    }
  ],
  "word": "acardiac"
}