"prismatic powder" meaning in English

{
  "forms": [
    {
      "form": "prismatic powders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "prismatic powder (plural prismatic powders)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of pebble (“a form of slow-burning gunpowder in large cubical grains”)."
      ],
      "id": "en-prismatic_powder-en-noun-T0yT9XOx",
      "links": [
        [
          "pebble",
          "pebble#English"
        ]
      ],
      "synonyms": [
        {
          "extra": "a form of slow-burning gunpowder in large cubical grains",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "pebble"
        }
      ]
    }
  ],
  "word": "prismatic powder"
}

{
  "forms": [
    {
      "form": "prismatic powders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "prismatic powder (plural prismatic powders)",
      "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",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Synonym of pebble (“a form of slow-burning gunpowder in large cubical grains”)."
      ],
      "links": [
        [
          "pebble",
          "pebble#English"
        ]
      ],
      "synonyms": [
        {
          "extra": "a form of slow-burning gunpowder in large cubical grains",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "pebble"
        }
      ]
    }
  ],
  "word": "prismatic powder"
}