"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": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "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 entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "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"
}