"monoprotonated" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mono",
        "3": "protonated"
      },
      "expansion": "mono- + protonated",
      "name": "prefix"
    }
  ],
  "etymology_text": "mono- + protonated",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "monoprotonated (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 mono-",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2015 August 18, “Structural Determinants for the Binding of Morphinan Agonists to the μ-Opioid Receptor”, in PLOS ONE, →DOI",
          "text": "H297 is monoprotonated at the Nε atom.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "protonated with a single proton (hydrogen ion)"
      ],
      "id": "en-monoprotonated-en-adj-MxbD-YXK",
      "links": [
        [
          "protonated",
          "protonated"
        ],
        [
          "proton",
          "proton"
        ],
        [
          "hydrogen",
          "hydrogen"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "monoprotonated"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mono",
        "3": "protonated"
      },
      "expansion": "mono- + protonated",
      "name": "prefix"
    }
  ],
  "etymology_text": "mono- + protonated",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "monoprotonated (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 mono-",
        "English terms with quotations",
        "English uncomparable adjectives"
      ],
      "examples": [
        {
          "ref": "2015 August 18, “Structural Determinants for the Binding of Morphinan Agonists to the μ-Opioid Receptor”, in PLOS ONE, →DOI",
          "text": "H297 is monoprotonated at the Nε atom.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "protonated with a single proton (hydrogen ion)"
      ],
      "links": [
        [
          "protonated",
          "protonated"
        ],
        [
          "proton",
          "proton"
        ],
        [
          "hydrogen",
          "hydrogen"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "monoprotonated"
}