"éis" meaning in Irish

{
  "etymology_templates": [
    {
      "args": {
        "1": "ga",
        "2": "ine-pro",
        "3": "*peth₂-"
      },
      "expansion": "",
      "name": "root"
    },
    {
      "args": {
        "1": "ga",
        "2": "sga",
        "3": "éis",
        "t": "track, trace"
      },
      "expansion": "Old Irish éis (“track, trace”)",
      "name": "inh"
    },
    {
      "args": {
        "1": "ga",
        "2": "cel-pro",
        "3": "*ɸanssā"
      },
      "expansion": "Proto-Celtic *ɸanssā",
      "name": "inh"
    },
    {
      "args": {
        "1": "ga",
        "2": "ine-pro",
        "3": "*peth₂-",
        "t": "to spread out"
      },
      "expansion": "Proto-Indo-European *peth₂- (“to spread out”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Old Irish éis (“track, trace”), from Proto-Celtic *ɸanssā, from Proto-Indo-European *peth₂- (“to spread out”).",
  "forms": [
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "ga-mut",
      "source": "mutation",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "éis",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-radical"
      ]
    },
    {
      "form": "n-éis",
      "source": "mutation",
      "tags": [
        "eclipsis",
        "mutation"
      ]
    },
    {
      "form": "héis",
      "source": "mutation",
      "tags": [
        "mutation",
        "prothesis-h"
      ]
    },
    {
      "form": "-",
      "source": "mutation",
      "tags": [
        "mutation",
        "prothesis-t"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ga",
        "2": "noun"
      },
      "expansion": "éis",
      "name": "head"
    }
  ],
  "inflection_templates": [
    {
      "args": {},
      "name": "ga-mut"
    }
  ],
  "lang": "Irish",
  "lang_code": "ga",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "ar éis"
        },
        {
          "word": "d'éis"
        },
        {
          "word": "dar éis"
        },
        {
          "word": "in éis"
        },
        {
          "word": "tar éis"
        },
        {
          "word": "thar éis"
        }
      ],
      "glosses": [
        "only used in certain phrases; see derived terms"
      ],
      "id": "en-éis-ga-noun-~QLvx3i2"
    }
  ],
  "sounds": [
    {
      "ipa": "/eːʃ/"
    }
  ],
  "word": "éis"
}

{
  "derived": [
    {
      "word": "ar éis"
    },
    {
      "word": "d'éis"
    },
    {
      "word": "dar éis"
    },
    {
      "word": "in éis"
    },
    {
      "word": "tar éis"
    },
    {
      "word": "thar éis"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "ga",
        "2": "ine-pro",
        "3": "*peth₂-"
      },
      "expansion": "",
      "name": "root"
    },
    {
      "args": {
        "1": "ga",
        "2": "sga",
        "3": "éis",
        "t": "track, trace"
      },
      "expansion": "Old Irish éis (“track, trace”)",
      "name": "inh"
    },
    {
      "args": {
        "1": "ga",
        "2": "cel-pro",
        "3": "*ɸanssā"
      },
      "expansion": "Proto-Celtic *ɸanssā",
      "name": "inh"
    },
    {
      "args": {
        "1": "ga",
        "2": "ine-pro",
        "3": "*peth₂-",
        "t": "to spread out"
      },
      "expansion": "Proto-Indo-European *peth₂- (“to spread out”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Old Irish éis (“track, trace”), from Proto-Celtic *ɸanssā, from Proto-Indo-European *peth₂- (“to spread out”).",
  "forms": [
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "ga-mut",
      "source": "mutation",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "éis",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-radical"
      ]
    },
    {
      "form": "n-éis",
      "source": "mutation",
      "tags": [
        "eclipsis",
        "mutation"
      ]
    },
    {
      "form": "héis",
      "source": "mutation",
      "tags": [
        "mutation",
        "prothesis-h"
      ]
    },
    {
      "form": "-",
      "source": "mutation",
      "tags": [
        "mutation",
        "prothesis-t"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ga",
        "2": "noun"
      },
      "expansion": "éis",
      "name": "head"
    }
  ],
  "inflection_templates": [
    {
      "args": {},
      "name": "ga-mut"
    }
  ],
  "lang": "Irish",
  "lang_code": "ga",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Irish entries with incorrect language header",
        "Irish lemmas",
        "Irish nouns",
        "Irish terms derived from Old Irish",
        "Irish terms derived from Proto-Celtic",
        "Irish terms derived from Proto-Indo-European",
        "Irish terms derived from the Proto-Indo-European root *peth₂-",
        "Irish terms inherited from Old Irish",
        "Irish terms inherited from Proto-Celtic",
        "Pages with 2 entries"
      ],
      "glosses": [
        "only used in certain phrases; see derived terms"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/eːʃ/"
    }
  ],
  "word": "éis"
}