"species barrier" meaning in English

{
  "forms": [
    {
      "form": "species barriers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "species barrier (plural species barriers)",
      "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"
        },
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        },
        {
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          "name": "Terms with German translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Pathology",
          "orig": "en:Pathology",
          "parents": [
            "Disease",
            "Medicine",
            "Health",
            "Biology",
            "Healthcare",
            "Body",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Zoology",
          "orig": "en:Zoology",
          "parents": [
            "Biology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2003 June 3, Sandra Blakeslee, “Mad Cows, Sane Cats: Making Sense of the 'Species Barrier'”, in The New York Times, →ISSN:",
          "text": "The people had died because they ate meat from infected cows. A species barrier had crumbled.",
          "type": "quote"
        },
        {
          "ref": "2004, W. Michael Scheld et al., editors, Infections of the Central Nervous System, Lippincott Williams & Wilkins, →ISBN, page 261:",
          "text": "The species barrier often is not an absolute barrier and refers to the difficulties in the transfer from one species to the next.",
          "type": "quote"
        }
      ],
      "glosses": [
        "The inability of a disease to be transmitted from one species to a different one."
      ],
      "id": "en-species_barrier-en-noun-fcIYGRmB",
      "links": [
        [
          "pathology",
          "pathology"
        ],
        [
          "zoology",
          "zoology"
        ],
        [
          "disease",
          "disease"
        ],
        [
          "transmit",
          "transmit"
        ]
      ],
      "raw_glosses": [
        "(pathology, zoology) The inability of a disease to be transmitted from one species to a different one."
      ],
      "topics": [
        "biology",
        "medicine",
        "natural-sciences",
        "pathology",
        "sciences",
        "zoology"
      ],
      "translations": [
        {
          "code": "fr",
          "lang": "French",
          "sense": "inability of a disease to be transmitted",
          "tags": [
            "feminine"
          ],
          "word": "barrière d’espèce"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "inability of a disease to be transmitted",
          "tags": [
            "feminine"
          ],
          "word": "Artengrenze"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "inability of a disease to be transmitted",
          "tags": [
            "feminine"
          ],
          "word": "Artenbarriere"
        }
      ]
    }
  ],
  "word": "species barrier"
}

{
  "forms": [
    {
      "form": "species barriers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "species barrier (plural species barriers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
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        "English multiword terms",
        "English nouns",
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        "Terms with French translations",
        "Terms with German translations",
        "en:Pathology",
        "en:Zoology"
      ],
      "examples": [
        {
          "ref": "2003 June 3, Sandra Blakeslee, “Mad Cows, Sane Cats: Making Sense of the 'Species Barrier'”, in The New York Times, →ISSN:",
          "text": "The people had died because they ate meat from infected cows. A species barrier had crumbled.",
          "type": "quote"
        },
        {
          "ref": "2004, W. Michael Scheld et al., editors, Infections of the Central Nervous System, Lippincott Williams & Wilkins, →ISBN, page 261:",
          "text": "The species barrier often is not an absolute barrier and refers to the difficulties in the transfer from one species to the next.",
          "type": "quote"
        }
      ],
      "glosses": [
        "The inability of a disease to be transmitted from one species to a different one."
      ],
      "links": [
        [
          "pathology",
          "pathology"
        ],
        [
          "zoology",
          "zoology"
        ],
        [
          "disease",
          "disease"
        ],
        [
          "transmit",
          "transmit"
        ]
      ],
      "raw_glosses": [
        "(pathology, zoology) The inability of a disease to be transmitted from one species to a different one."
      ],
      "topics": [
        "biology",
        "medicine",
        "natural-sciences",
        "pathology",
        "sciences",
        "zoology"
      ]
    }
  ],
  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "sense": "inability of a disease to be transmitted",
      "tags": [
        "feminine"
      ],
      "word": "barrière d’espèce"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "inability of a disease to be transmitted",
      "tags": [
        "feminine"
      ],
      "word": "Artengrenze"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "inability of a disease to be transmitted",
      "tags": [
        "feminine"
      ],
      "word": "Artenbarriere"
    }
  ],
  "word": "species barrier"
}