"caustic curve" meaning in English

{
  "forms": [
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      "form": "caustic curves",
      "tags": [
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      "expansion": "caustic curve (plural caustic curves)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "text": "Caustic curves and surfaces are called catacaustic when formed by reflection, and diacaustic when formed by refraction."
        }
      ],
      "glosses": [
        "A curve to which the ray of light, reflected or refracted by another curve, are tangents, the reflecting or refracting curve and the luminous point being in one plane."
      ],
      "id": "en-caustic_curve-en-noun-8gNiMUEP",
      "links": [
        [
          "optics",
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      "raw_glosses": [
        "(optics) A curve to which the ray of light, reflected or refracted by another curve, are tangents, the reflecting or refracting curve and the luminous point being in one plane."
      ],
      "related": [
        {
          "word": "caustic"
        },
        {
          "word": "caustic surface"
        },
        {
          "word": "focus"
        }
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "optics",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "caustic curve"
}

{
  "forms": [
    {
      "form": "caustic curves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "expansion": "caustic curve (plural caustic curves)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "caustic"
    },
    {
      "word": "caustic surface"
    },
    {
      "word": "focus"
    }
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      "examples": [
        {
          "text": "Caustic curves and surfaces are called catacaustic when formed by reflection, and diacaustic when formed by refraction."
        }
      ],
      "glosses": [
        "A curve to which the ray of light, reflected or refracted by another curve, are tangents, the reflecting or refracting curve and the luminous point being in one plane."
      ],
      "links": [
        [
          "optics",
          "optics"
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      "raw_glosses": [
        "(optics) A curve to which the ray of light, reflected or refracted by another curve, are tangents, the reflecting or refracting curve and the luminous point being in one plane."
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "optics",
        "physical-sciences",
        "physics"
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  "word": "caustic curve"
}