"третииникъ" meaning in Old East Slavic

{
  "etymology_templates": [
    {
      "args": {
        "1": "orv",
        "2": "третии",
        "3": "-ьникъ",
        "t1": "third"
      },
      "expansion": "третии (tretii, “third”) + -ьникъ (-ĭnikŭ)",
      "name": "affix"
    }
  ],
  "etymology_text": "From третии (tretii, “third”) + -ьникъ (-ĭnikŭ).",
  "forms": [
    {
      "form": "tretiinikŭ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "orv",
        "2": "noun",
        "g": "m"
      },
      "expansion": "третииникъ (tretiinikŭ) m",
      "name": "head"
    }
  ],
  "lang": "Old East Slavic",
  "lang_code": "orv",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old East Slavic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Old East Slavic terms suffixed with -ьникъ",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Wednesday"
      ],
      "id": "en-третииникъ-orv-noun-wKbMgpzQ",
      "links": [
        [
          "Wednesday",
          "Wednesday"
        ]
      ],
      "related": [
        {
          "roman": "ponedělĭnikŭ",
          "topics": [
            "days-of-the-week",
            "weekdays",
            "time"
          ],
          "word": "понедѣльникъ"
        },
        {
          "roman": "vŭtorĭnikŭ",
          "word": "въторьникъ"
        },
        {
          "roman": "sereda",
          "word": "середа"
        },
        {
          "roman": "četvĭrtŭkŭ",
          "word": "четвьртъкъ"
        },
        {
          "roman": "četvĭrgŭ",
          "word": "четвьргъ"
        },
        {
          "roman": "pętŭkŭ",
          "word": "пѧтъкъ"
        },
        {
          "roman": "pętĭnica",
          "word": "пѧтьница"
        },
        {
          "roman": "subota",
          "word": "субота"
        },
        {
          "roman": "nedělja",
          "word": "недѣлꙗ"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "третииникъ"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "orv",
        "2": "третии",
        "3": "-ьникъ",
        "t1": "third"
      },
      "expansion": "третии (tretii, “third”) + -ьникъ (-ĭnikŭ)",
      "name": "affix"
    }
  ],
  "etymology_text": "From третии (tretii, “third”) + -ьникъ (-ĭnikŭ).",
  "forms": [
    {
      "form": "tretiinikŭ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "orv",
        "2": "noun",
        "g": "m"
      },
      "expansion": "третииникъ (tretiinikŭ) m",
      "name": "head"
    }
  ],
  "lang": "Old East Slavic",
  "lang_code": "orv",
  "pos": "noun",
  "related": [
    {
      "roman": "ponedělĭnikŭ",
      "topics": [
        "days-of-the-week",
        "weekdays",
        "time"
      ],
      "word": "понедѣльникъ"
    },
    {
      "roman": "vŭtorĭnikŭ",
      "word": "въторьникъ"
    },
    {
      "roman": "sereda",
      "word": "середа"
    },
    {
      "roman": "četvĭrtŭkŭ",
      "word": "четвьртъкъ"
    },
    {
      "roman": "četvĭrgŭ",
      "word": "четвьргъ"
    },
    {
      "roman": "pętŭkŭ",
      "word": "пѧтъкъ"
    },
    {
      "roman": "pętĭnica",
      "word": "пѧтьница"
    },
    {
      "roman": "subota",
      "word": "субота"
    },
    {
      "roman": "nedělja",
      "word": "недѣлꙗ"
    }
  ],
  "senses": [
    {
      "categories": [
        "Old East Slavic entries with incorrect language header",
        "Old East Slavic lemmas",
        "Old East Slavic masculine nouns",
        "Old East Slavic nouns",
        "Old East Slavic terms suffixed with -ьникъ"
      ],
      "glosses": [
        "Wednesday"
      ],
      "links": [
        [
          "Wednesday",
          "Wednesday"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "третииникъ"
}