"a'a" meaning in English

{
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      "expansion": "a'a (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "aa"
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      "examples": [
        {
          "ref": "1883, Clarence E. Dutton, Fourth Annual report of the United States Geological Survey",
          "text": "The second form of the lavas is called by the natives a-a, and its contrast with pahoehoe is about the greatest imaginable. It consists mainly of clinkers sometimes detached, sometimes partially agglutinated together with a bristling array of sharp, jagged, angular fragments."
        },
        {
          "ref": "1999, A. Ganeri, Violent Volcanoes",
          "text": "A'a is thick, sticky lava which forms jagged, chunky rock when it cools.",
          "type": "quotation"
        },
        {
          "ref": "2004, Richard Fortey, The Earth, Folio Society, published 2011, page 44",
          "text": "I overheard a geologist say that a good pair of boots can be rasped to bits on a‘a in a couple of months.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of aa"
      ],
      "id": "en-a'a-en-noun-6t-dI5uc",
      "links": [
        [
          "aa",
          "aa#English"
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      ],
      "tags": [
        "alt-of",
        "alternative",
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    }
  ],
  "word": "a'a"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
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      "expansion": "a'a (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "aa"
        }
      ],
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms with quotations",
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      "examples": [
        {
          "ref": "1883, Clarence E. Dutton, Fourth Annual report of the United States Geological Survey",
          "text": "The second form of the lavas is called by the natives a-a, and its contrast with pahoehoe is about the greatest imaginable. It consists mainly of clinkers sometimes detached, sometimes partially agglutinated together with a bristling array of sharp, jagged, angular fragments."
        },
        {
          "ref": "1999, A. Ganeri, Violent Volcanoes",
          "text": "A'a is thick, sticky lava which forms jagged, chunky rock when it cools.",
          "type": "quotation"
        },
        {
          "ref": "2004, Richard Fortey, The Earth, Folio Society, published 2011, page 44",
          "text": "I overheard a geologist say that a good pair of boots can be rasped to bits on a‘a in a couple of months.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of aa"
      ],
      "links": [
        [
          "aa",
          "aa#English"
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      "tags": [
        "alt-of",
        "alternative",
        "uncountable"
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    }
  ],
  "word": "a'a"
}