"echall" meaning in Middle Irish

{
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "eball",
        "3": "",
        "4": "colt, horse under two years old"
      },
      "expansion": "Welsh eball (“colt, horse under two years old”)",
      "name": "cog"
    }
  ],
  "etymology_text": "From ech. Compare Welsh eball (“colt, horse under two years old”).",
  "head_templates": [
    {
      "args": {
        "1": "mga",
        "2": "noun"
      },
      "expansion": "echall",
      "name": "head"
    }
  ],
  "lang": "Middle Irish",
  "lang_code": "mga",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Middle 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"
        },
        {
          "kind": "lifeform",
          "langcode": "mga",
          "name": "Horses",
          "orig": "mga:Horses",
          "parents": [
            "Equids",
            "Livestock",
            "Odd-toed ungulates",
            "Agriculture",
            "Animals",
            "Mammals",
            "Applied sciences",
            "Lifeforms",
            "Vertebrates",
            "Sciences",
            "All topics",
            "Life",
            "Chordates",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "a type of horse"
      ],
      "id": "en-echall-mga-noun-NJD3TnCs",
      "links": [
        [
          "horse",
          "horse"
        ]
      ]
    }
  ],
  "word": "echall"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "eball",
        "3": "",
        "4": "colt, horse under two years old"
      },
      "expansion": "Welsh eball (“colt, horse under two years old”)",
      "name": "cog"
    }
  ],
  "etymology_text": "From ech. Compare Welsh eball (“colt, horse under two years old”).",
  "head_templates": [
    {
      "args": {
        "1": "mga",
        "2": "noun"
      },
      "expansion": "echall",
      "name": "head"
    }
  ],
  "lang": "Middle Irish",
  "lang_code": "mga",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Middle Irish entries with incorrect language header",
        "Middle Irish lemmas",
        "Middle Irish nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "mga:Horses"
      ],
      "glosses": [
        "a type of horse"
      ],
      "links": [
        [
          "horse",
          "horse"
        ]
      ]
    }
  ],
  "word": "echall"
}