"syn" meaning in Slovaque

{
  "categories": [
    {
      "kind": "other",
      "name": "Mots en slovaque issus d’un mot en vieux slave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en slovaque",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Slovaque",
      "orig": "slovaque",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "word": "synak"
    }
  ],
  "etymology_texts": [
    "Du vieux slave сынъ, synŭ."
  ],
  "lang": "Slovaque",
  "lang_code": "sk",
  "notes": [
    "Syn est l’un des très rares mots slovaques à encore posséder un vocatif, mais son emploi n’est pas obligatoire."
  ],
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "masculin animé"
  ],
  "related": [
    {
      "word": "dcéra"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en slovaque de la famille",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Fils."
      ],
      "id": "fr-syn-sk-noun-UmGvxinA",
      "raw_tags": [
        "Famille"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\sɪn\\"
    }
  ],
  "word": "syn"
}

{
  "categories": [
    "Mots en slovaque issus d’un mot en vieux slave",
    "Noms communs en slovaque",
    "slovaque"
  ],
  "derived": [
    {
      "word": "synak"
    }
  ],
  "etymology_texts": [
    "Du vieux slave сынъ, synŭ."
  ],
  "lang": "Slovaque",
  "lang_code": "sk",
  "notes": [
    "Syn est l’un des très rares mots slovaques à encore posséder un vocatif, mais son emploi n’est pas obligatoire."
  ],
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "masculin animé"
  ],
  "related": [
    {
      "word": "dcéra"
    }
  ],
  "senses": [
    {
      "categories": [
        "Lexique en slovaque de la famille"
      ],
      "glosses": [
        "Fils."
      ],
      "raw_tags": [
        "Famille"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\sɪn\\"
    }
  ],
  "word": "syn"
}