"Janus particle" meaning in English

{
  "etymology_text": "In reference to the two-faced god Janus.",
  "forms": [
    {
      "form": "Janus particles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Janus particle (plural Janus particles)",
      "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": "Nanotechnology",
          "orig": "en:Nanotechnology",
          "parents": [
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A spherical microscopic particle which has hemispheres with sharply differing properties, such as one hydrophilic hemisphere and one hydrophobic hemisphere"
      ],
      "id": "en-Janus_particle-en-noun-J77J0BEF",
      "links": [
        [
          "nanotechnology",
          "nanotechnology"
        ],
        [
          "physics",
          "physics"
        ],
        [
          "hemisphere",
          "hemisphere"
        ],
        [
          "hydrophilic",
          "hydrophilic"
        ],
        [
          "hydrophobic",
          "hydrophobic"
        ]
      ],
      "raw_glosses": [
        "(nanotechnology, physics) A spherical microscopic particle which has hemispheres with sharply differing properties, such as one hydrophilic hemisphere and one hydrophobic hemisphere"
      ],
      "topics": [
        "engineering",
        "nanotechnology",
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "Janus particle"
}

{
  "etymology_text": "In reference to the two-faced god Janus.",
  "forms": [
    {
      "form": "Janus particles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Janus particle (plural Janus particles)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Nanotechnology",
        "en:Physics"
      ],
      "glosses": [
        "A spherical microscopic particle which has hemispheres with sharply differing properties, such as one hydrophilic hemisphere and one hydrophobic hemisphere"
      ],
      "links": [
        [
          "nanotechnology",
          "nanotechnology"
        ],
        [
          "physics",
          "physics"
        ],
        [
          "hemisphere",
          "hemisphere"
        ],
        [
          "hydrophilic",
          "hydrophilic"
        ],
        [
          "hydrophobic",
          "hydrophobic"
        ]
      ],
      "raw_glosses": [
        "(nanotechnology, physics) A spherical microscopic particle which has hemispheres with sharply differing properties, such as one hydrophilic hemisphere and one hydrophobic hemisphere"
      ],
      "topics": [
        "engineering",
        "nanotechnology",
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "Janus particle"
}