"606" meaning in English

{
  "etymology_text": "It was the 606th chemical studied by Ehrlich in his quest for an antisyphilitic drug.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "606 (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Drugs",
          "orig": "en:Drugs",
          "parents": [
            "Matter",
            "Pharmacology",
            "Chemistry",
            "Nature",
            "Biochemistry",
            "Medicine",
            "Sciences",
            "All topics",
            "Biology",
            "Healthcare",
            "Fundamental",
            "Health",
            "Body"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1910, The Journal of Ophthalmology and Oto-laryngology, volume 4:",
          "text": "Within these last five years we have discovered the spirochaeta pallida, the Wasserman reaction and dioxydiamidoarsenobenzol or 606; […]",
          "type": "quote"
        },
        {
          "ref": "1974, Lawrence Durrell, Monsieur, Faber & Faber, published 1992, page 108:",
          "text": "At any rate I had told her what I knew about 606, and asked Akkad to send her to a specialist.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Arsphenamine."
      ],
      "id": "en-606-en-noun-14iLmlQ~",
      "links": [
        [
          "Arsphenamine",
          "arsphenamine"
        ]
      ],
      "synonyms": [
        {
          "word": "arsphenamine"
        },
        {
          "word": "salvarsan"
        }
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "606"
}

{
  "etymology_text": "It was the 606th chemical studied by Ehrlich in his quest for an antisyphilitic drug.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "606 (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English palindromes",
        "English terms spelled with numbers",
        "English terms with quotations",
        "English uncountable nouns",
        "English words without vowels",
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned",
        "en:Drugs"
      ],
      "examples": [
        {
          "ref": "1910, The Journal of Ophthalmology and Oto-laryngology, volume 4:",
          "text": "Within these last five years we have discovered the spirochaeta pallida, the Wasserman reaction and dioxydiamidoarsenobenzol or 606; […]",
          "type": "quote"
        },
        {
          "ref": "1974, Lawrence Durrell, Monsieur, Faber & Faber, published 1992, page 108:",
          "text": "At any rate I had told her what I knew about 606, and asked Akkad to send her to a specialist.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Arsphenamine."
      ],
      "links": [
        [
          "Arsphenamine",
          "arsphenamine"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "arsphenamine"
    },
    {
      "word": "salvarsan"
    }
  ],
  "word": "606"
}