"prn" meaning in English

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      "expansion": "prn",
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "alt_of": [
        {
          "word": "pro re nata"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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          "source": "w"
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Medicine",
          "orig": "en:Medicine",
          "parents": [
            "Biology",
            "Healthcare",
            "Sciences",
            "Health",
            "All topics",
            "Body",
            "Fundamental"
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          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Alternative forms: PRN, p.r.n."
        },
        {
          "ref": "1988, E[dward] J[ames] Moran Campbell, Not Always on the Level, [London]: British Medical Journal, →ISBN, page 182:",
          "text": "“‘My return fare was £171. 6s. 0d. and I enclose the counterfoil. I have no record of other expenses; the major items were chilled liquid sedatives on the flight home at 55 cents a shot. Although taken prn, the last dose I remember is the fourth.”",
          "type": "quote"
        }
      ],
      "glosses": [
        "Abbreviation of pro re nata."
      ],
      "id": "en-prn-en-phrase-C5V2dzdG",
      "links": [
        [
          "medicine",
          "medicine"
        ],
        [
          "pro re nata",
          "pro re nata#English"
        ]
      ],
      "raw_glosses": [
        "(medicine) Abbreviation of pro re nata."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "medicine",
        "sciences"
      ]
    }
  ],
  "word": "prn"
}

{
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "alt_of": [
        {
          "word": "pro re nata"
        }
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        "Pages with entries",
        "en:Medicine"
      ],
      "examples": [
        {
          "text": "Alternative forms: PRN, p.r.n."
        },
        {
          "ref": "1988, E[dward] J[ames] Moran Campbell, Not Always on the Level, [London]: British Medical Journal, →ISBN, page 182:",
          "text": "“‘My return fare was £171. 6s. 0d. and I enclose the counterfoil. I have no record of other expenses; the major items were chilled liquid sedatives on the flight home at 55 cents a shot. Although taken prn, the last dose I remember is the fourth.”",
          "type": "quote"
        }
      ],
      "glosses": [
        "Abbreviation of pro re nata."
      ],
      "links": [
        [
          "medicine",
          "medicine"
        ],
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          "pro re nata",
          "pro re nata#English"
        ]
      ],
      "raw_glosses": [
        "(medicine) Abbreviation of pro re nata."
      ],
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        "abbreviation",
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      "topics": [
        "medicine",
        "sciences"
      ]
    }
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  "word": "prn"
}