"irráir" meaning in Old Irish

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "ga",
            "2": "aréir"
          },
          "expansion": "Irish: aréir",
          "name": "desc"
        }
      ],
      "text": "Irish: aréir"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "gv",
            "2": "riyr"
          },
          "expansion": "Manx: riyr",
          "name": "desc"
        }
      ],
      "text": "Manx: riyr"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "gd",
            "2": "a-raoir"
          },
          "expansion": "Scottish Gaelic: a-raoir",
          "name": "desc"
        }
      ],
      "text": "Scottish Gaelic: a-raoir"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "ar",
        "alt2": "*fár",
        "t1": "before",
        "t2": "dawn"
      },
      "expansion": "ar (“before”) + *fár (“dawn”)",
      "name": "compound"
    },
    {
      "args": {
        "1": "mga",
        "2": "fáir"
      },
      "expansion": "Middle Irish fáir",
      "name": "m+"
    },
    {
      "args": {
        "1": "sga",
        "2": "co",
        "alt2": "*fár",
        "lit": "with dawn",
        "nocat": "1"
      },
      "expansion": "co + *fár, literally “with dawn”",
      "name": "compound"
    },
    {
      "args": {
        "1": "cy",
        "2": "gwawr",
        "t": "dawn"
      },
      "expansion": "Welsh gwawr (“dawn”)",
      "name": "cog"
    }
  ],
  "etymology_text": "From ar (“before”) + *fár (“dawn”) (> Middle Irish fáir). Compare camáir (“dawn”) (< co + *fár, literally “with dawn”). Cognate with Welsh gwawr (“dawn”).",
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "adverb"
      },
      "expansion": "irráir",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "last night"
      ],
      "id": "en-irráir-sga-adv-i2S-nVmX",
      "links": [
        [
          "last night",
          "last night"
        ]
      ]
    }
  ],
  "word": "irráir"
}

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "ga",
            "2": "aréir"
          },
          "expansion": "Irish: aréir",
          "name": "desc"
        }
      ],
      "text": "Irish: aréir"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "gv",
            "2": "riyr"
          },
          "expansion": "Manx: riyr",
          "name": "desc"
        }
      ],
      "text": "Manx: riyr"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "gd",
            "2": "a-raoir"
          },
          "expansion": "Scottish Gaelic: a-raoir",
          "name": "desc"
        }
      ],
      "text": "Scottish Gaelic: a-raoir"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "ar",
        "alt2": "*fár",
        "t1": "before",
        "t2": "dawn"
      },
      "expansion": "ar (“before”) + *fár (“dawn”)",
      "name": "compound"
    },
    {
      "args": {
        "1": "mga",
        "2": "fáir"
      },
      "expansion": "Middle Irish fáir",
      "name": "m+"
    },
    {
      "args": {
        "1": "sga",
        "2": "co",
        "alt2": "*fár",
        "lit": "with dawn",
        "nocat": "1"
      },
      "expansion": "co + *fár, literally “with dawn”",
      "name": "compound"
    },
    {
      "args": {
        "1": "cy",
        "2": "gwawr",
        "t": "dawn"
      },
      "expansion": "Welsh gwawr (“dawn”)",
      "name": "cog"
    }
  ],
  "etymology_text": "From ar (“before”) + *fár (“dawn”) (> Middle Irish fáir). Compare camáir (“dawn”) (< co + *fár, literally “with dawn”). Cognate with Welsh gwawr (“dawn”).",
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "adverb"
      },
      "expansion": "irráir",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Old Irish adverbs",
        "Old Irish compound terms",
        "Old Irish entries with incorrect language header",
        "Old Irish lemmas",
        "Old Irish time adverbs",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "last night"
      ],
      "links": [
        [
          "last night",
          "last night"
        ]
      ]
    }
  ],
  "word": "irráir"
}