"nasolabial triangle" meaning in English

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          "ref": "1933, The Year Book of Pediatrics, volume 1940:",
          "text": "For that reason they may appear frequently in syntropism with the sharply demarcated malar flush and anemic nasolabial triangle, even without scarlet fever.",
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          "ref": "1959, U.S. Surgeon General's Office, Translations from the Soviet Literature on Hemorrhagic Fever: 1944–1951, page 2:",
          "text": "Hyperemia of the face, which stands out during the first few days of the illness (white nasolabial triangle), is changed to a peculiar paleness of the face that looks like a mask.",
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          "ref": "1988, John M. Loré, An Atlas of Head and Neck Surgery, page 400:",
          "text": "Before all these sutures are tied, the mucous membranes of the edges of the nasolabial triangle are closed.",
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          "ref": "2009, Melvin A. Shiffman, editor, Autologous Fat Transfer: Art, Science, and Clinical Practice, Springer, page 422:",
          "text": "This is especially likely to occur in the presence of infection in the upper lip, lower part of the nose, and adjoining nasolabial triangle.",
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        "A triangular area of the face encompassing the lips and nose."
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        "(anatomy) A triangular area of the face encompassing the lips and nose."
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          "word": "danger triangle of the face"
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          "word": "triangle of death"
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  "word": "nasolabial triangle"
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          "ref": "1959, U.S. Surgeon General's Office, Translations from the Soviet Literature on Hemorrhagic Fever: 1944–1951, page 2:",
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          "text": "This is especially likely to occur in the presence of infection in the upper lip, lower part of the nose, and adjoining nasolabial triangle.",
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        "(anatomy) A triangular area of the face encompassing the lips and nose."
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  "word": "nasolabial triangle"
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