"steradián" meaning in Tchèque

{
  "categories": [
    {
      "kind": "other",
      "name": "Genres manquants en tchèque",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Lemmes en tchèque",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en tchèque",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Unités de mesure en tchèque",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Tchèque",
      "orig": "tchèque",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Tchèque",
  "lang_code": "cs",
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "genre à préciser : {{m}}, {{f}}, {{mf}}, {{n}} ?"
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en tchèque de la géométrie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Stéradian."
      ],
      "id": "fr-steradián-cs-noun-DO-ET3~n",
      "topics": [
        "geometry",
        "metrology"
      ]
    }
  ],
  "word": "steradián"
}

{
  "categories": [
    "Genres manquants en tchèque",
    "Lemmes en tchèque",
    "Noms communs en tchèque",
    "Unités de mesure en tchèque",
    "tchèque"
  ],
  "lang": "Tchèque",
  "lang_code": "cs",
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "genre à préciser : {{m}}, {{f}}, {{mf}}, {{n}} ?"
  ],
  "senses": [
    {
      "categories": [
        "Lexique en tchèque de la géométrie"
      ],
      "glosses": [
        "Stéradian."
      ],
      "topics": [
        "geometry",
        "metrology"
      ]
    }
  ],
  "word": "steradián"
}