"prebleach" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "pre",
        "3": "bleach"
      },
      "expansion": "pre- + bleach",
      "name": "prefix"
    }
  ],
  "etymology_text": "pre- + bleach",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "prebleach (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "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 terms prefixed with pre-",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2015 October 29, “Delineating the Tes Interaction Site in Zyxin and Studying Cellular Effects of Its Disruption”, in PLOS ONE, →DOI",
          "text": "Right panels represent the time-course of a FRAP experiment: prebleach image (top), first image after bleach (middle), 100 s after start of acquisition (bottom).",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Before a bleaching operation."
      ],
      "id": "en-prebleach-en-adj-MNaF2VRC",
      "links": [
        [
          "bleach",
          "bleach"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "prebleach"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "pre",
        "3": "bleach"
      },
      "expansion": "pre- + bleach",
      "name": "prefix"
    }
  ],
  "etymology_text": "pre- + bleach",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "prebleach (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms prefixed with pre-",
        "English terms with quotations",
        "English uncomparable adjectives"
      ],
      "examples": [
        {
          "ref": "2015 October 29, “Delineating the Tes Interaction Site in Zyxin and Studying Cellular Effects of Its Disruption”, in PLOS ONE, →DOI",
          "text": "Right panels represent the time-course of a FRAP experiment: prebleach image (top), first image after bleach (middle), 100 s after start of acquisition (bottom).",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Before a bleaching operation."
      ],
      "links": [
        [
          "bleach",
          "bleach"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "prebleach"
}