"losůsek" meaning in Czech

{
  "head_templates": [
    {
      "args": {
        "1": "m-an"
      },
      "expansion": "losůsek m anim",
      "name": "cs-noun"
    }
  ],
  "lang": "Czech",
  "lang_code": "cs",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Czech entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "cs",
          "name": "Salmonids",
          "orig": "cs:Salmonids",
          "parents": [
            "Fish",
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "losos"
        }
      ],
      "glosses": [
        "diminutive of losos"
      ],
      "id": "en-losůsek-cs-noun-eSYroS3W",
      "links": [
        [
          "losos",
          "losos#Czech"
        ]
      ],
      "synonyms": [
        {
          "word": "lososek"
        }
      ],
      "tags": [
        "animate",
        "diminutive",
        "form-of",
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈlosuːsɛk]"
    }
  ],
  "word": "losůsek"
}

{
  "head_templates": [
    {
      "args": {
        "1": "m-an"
      },
      "expansion": "losůsek m anim",
      "name": "cs-noun"
    }
  ],
  "lang": "Czech",
  "lang_code": "cs",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Czech animate nouns",
        "Czech diminutive nouns",
        "Czech entries with incorrect language header",
        "Czech lemmas",
        "Czech masculine nouns",
        "Czech nouns",
        "Czech terms with IPA pronunciation",
        "cs:Salmonids"
      ],
      "form_of": [
        {
          "word": "losos"
        }
      ],
      "glosses": [
        "diminutive of losos"
      ],
      "links": [
        [
          "losos",
          "losos#Czech"
        ]
      ],
      "tags": [
        "animate",
        "diminutive",
        "form-of",
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈlosuːsɛk]"
    }
  ],
  "synonyms": [
    {
      "word": "lososek"
    }
  ],
  "word": "losůsek"
}