"hair tonic" meaning in English

{
  "forms": [
    {
      "form": "hair tonics",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hair tonic (plural hair tonics)",
      "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": "Hair",
          "orig": "en:Hair",
          "parents": [
            "Body parts",
            "Body",
            "Anatomy",
            "All topics",
            "Biology",
            "Medicine",
            "Fundamental",
            "Sciences",
            "Healthcare",
            "Health"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2006, Victoria Sherrow, Encyclopedia of Hair: A Cultural History, page 375:",
          "text": "One of the best-selling hair tonics was Vaseline hair tonic for men, manufactured by Chesebrough Manufacturing Company (later Chesebrough-Ponds).",
          "type": "quote"
        }
      ],
      "glosses": [
        "A liquid or gelatinous substance applied to the hair on one's head to improve its appearance in various ways."
      ],
      "id": "en-hair_tonic-en-noun-uzpNsZhC"
    }
  ],
  "word": "hair tonic"
}

{
  "forms": [
    {
      "form": "hair tonics",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hair tonic (plural hair tonics)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned",
        "en:Hair"
      ],
      "examples": [
        {
          "ref": "2006, Victoria Sherrow, Encyclopedia of Hair: A Cultural History, page 375:",
          "text": "One of the best-selling hair tonics was Vaseline hair tonic for men, manufactured by Chesebrough Manufacturing Company (later Chesebrough-Ponds).",
          "type": "quote"
        }
      ],
      "glosses": [
        "A liquid or gelatinous substance applied to the hair on one's head to improve its appearance in various ways."
      ]
    }
  ],
  "word": "hair tonic"
}