"трьнъ" meaning in Old Church Slavonic

{
  "etymology_templates": [
    {
      "args": {
        "1": "cu",
        "2": "sla-pro",
        "3": "*tьrnъ"
      },
      "expansion": "Proto-Slavic *tьrnъ",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Slavic *tьrnъ.",
  "forms": [
    {
      "form": "trĭnŭ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "cu",
        "2": "noun",
        "g": "m",
        "g2": "",
        "g3": "",
        "head": "",
        "sc": "",
        "tr": ""
      },
      "expansion": "трьнъ • (trĭnŭ) m",
      "name": "head"
    },
    {
      "args": {
        "1": "m"
      },
      "expansion": "трьнъ • (trĭnŭ) m",
      "name": "cu-noun"
    }
  ],
  "lang": "Old Church Slavonic",
  "lang_code": "cu",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Church Slavonic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Old Church Slavonic entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "cu",
          "name": "Botany",
          "orig": "cu:Botany",
          "parents": [
            "Biology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "thorn"
      ],
      "id": "en-трьнъ-cu-noun-BJruvsjr",
      "links": [
        [
          "thorn",
          "thorn"
        ]
      ]
    }
  ],
  "word": "трьнъ"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "cu",
        "2": "sla-pro",
        "3": "*tьrnъ"
      },
      "expansion": "Proto-Slavic *tьrnъ",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Slavic *tьrnъ.",
  "forms": [
    {
      "form": "trĭnŭ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "cu",
        "2": "noun",
        "g": "m",
        "g2": "",
        "g3": "",
        "head": "",
        "sc": "",
        "tr": ""
      },
      "expansion": "трьнъ • (trĭnŭ) m",
      "name": "head"
    },
    {
      "args": {
        "1": "m"
      },
      "expansion": "трьнъ • (trĭnŭ) m",
      "name": "cu-noun"
    }
  ],
  "lang": "Old Church Slavonic",
  "lang_code": "cu",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Old Church Slavonic entries with incorrect language header",
        "Old Church Slavonic entries with topic categories using raw markup",
        "Old Church Slavonic lemmas",
        "Old Church Slavonic masculine nouns",
        "Old Church Slavonic nouns",
        "Old Church Slavonic terms derived from Proto-Slavic",
        "Old Church Slavonic terms inherited from Proto-Slavic",
        "cu:Botany"
      ],
      "glosses": [
        "thorn"
      ],
      "links": [
        [
          "thorn",
          "thorn"
        ]
      ]
    }
  ],
  "word": "трьнъ"
}