"Janus cat" meaning in English

{
  "etymology_text": "After the Roman god with two faces.",
  "forms": [
    {
      "form": "Janus cats",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Janus cat (plural Janus cats)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "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 entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Cats",
          "orig": "en:Cats",
          "parents": [
            "Felids",
            "Carnivores",
            "Mammals",
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A cat with diprosopus."
      ],
      "id": "en-Janus_cat-en-noun-cqf2~YD7",
      "links": [
        [
          "cat",
          "cat"
        ],
        [
          "diprosopus",
          "diprosopus"
        ]
      ]
    }
  ],
  "word": "Janus cat"
}

{
  "etymology_text": "After the Roman god with two faces.",
  "forms": [
    {
      "form": "Janus cats",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Janus cat (plural Janus cats)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "en:Cats"
      ],
      "glosses": [
        "A cat with diprosopus."
      ],
      "links": [
        [
          "cat",
          "cat"
        ],
        [
          "diprosopus",
          "diprosopus"
        ]
      ]
    }
  ],
  "word": "Janus cat"
}