"picogramme" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "pico",
        "3": "gramme"
      },
      "expansion": "pico- + gramme",
      "name": "prefix"
    }
  ],
  "etymology_text": "pico- + gramme",
  "forms": [
    {
      "form": "picogrammes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "picogramme (plural picogrammes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "picogram"
        }
      ],
      "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 pico-",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Rare spelling of picogram."
      ],
      "id": "en-picogramme-en-noun-6IAP8Ea4",
      "links": [
        [
          "picogram",
          "picogram#English"
        ]
      ],
      "raw_glosses": [
        "(British spelling) Rare spelling of picogram."
      ],
      "tags": [
        "UK",
        "alt-of",
        "rare"
      ]
    }
  ],
  "word": "picogramme"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "pico",
        "3": "gramme"
      },
      "expansion": "pico- + gramme",
      "name": "prefix"
    }
  ],
  "etymology_text": "pico- + gramme",
  "forms": [
    {
      "form": "picogrammes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "picogramme (plural picogrammes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "picogram"
        }
      ],
      "categories": [
        "British English forms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English rare forms",
        "English terms prefixed with pico-"
      ],
      "glosses": [
        "Rare spelling of picogram."
      ],
      "links": [
        [
          "picogram",
          "picogram#English"
        ]
      ],
      "raw_glosses": [
        "(British spelling) Rare spelling of picogram."
      ],
      "tags": [
        "UK",
        "alt-of",
        "rare"
      ]
    }
  ],
  "word": "picogramme"
}