"over medium" meaning in English

{
  "head_templates": [
    {
      "args": {
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        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "over medium",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "over medium",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "parents": [
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          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Eggs",
          "orig": "en:Eggs",
          "parents": [
            "Birds",
            "Foods",
            "Reproduction",
            "Vertebrates",
            "Eating",
            "Food and drink",
            "Life",
            "Chordates",
            "Human behaviour",
            "All topics",
            "Nature",
            "Animals",
            "Human",
            "Fundamental",
            "Lifeforms"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "sunny side up"
        },
        {
          "word": "over easy"
        },
        {
          "word": "over hard"
        }
      ],
      "glosses": [
        "Of an egg prepared as food, fried on both sides so as the whites are cooked, and the yolks are soft, but not runny."
      ],
      "id": "en-over_medium-en-prep_phrase-M5jXLPrB",
      "links": [
        [
          "fried",
          "fried egg"
        ]
      ],
      "raw_glosses": [
        "(US) Of an egg prepared as food, fried on both sides so as the whites are cooked, and the yolks are soft, but not runny."
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "word": "over medium"
}

{
  "coordinate_terms": [
    {
      "word": "sunny side up"
    },
    {
      "word": "over easy"
    },
    {
      "word": "over hard"
    }
  ],
  "head_templates": [
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      "args": {
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        "2": "prepositional phrase",
        "head": ""
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      "expansion": "over medium",
      "name": "head"
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    {
      "args": {},
      "expansion": "over medium",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        "American English",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English prepositional phrases",
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        "en:Eggs"
      ],
      "glosses": [
        "Of an egg prepared as food, fried on both sides so as the whites are cooked, and the yolks are soft, but not runny."
      ],
      "links": [
        [
          "fried",
          "fried egg"
        ]
      ],
      "raw_glosses": [
        "(US) Of an egg prepared as food, fried on both sides so as the whites are cooked, and the yolks are soft, but not runny."
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "word": "over medium"
}