"MLLW" meaning in English

{
  "forms": [
    {
      "form": "MLLWs",
      "tags": [
        "plural"
      ]
    }
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  "head_templates": [
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      "expansion": "MLLW (countable and uncountable, plural MLLWs)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "mean lower low water"
        }
      ],
      "categories": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
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          "name": "Oceanography",
          "orig": "en:Oceanography",
          "parents": [],
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        {
          "kind": "other",
          "langcode": "en",
          "name": "Tides",
          "orig": "en:Tides",
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          "bold_text_offsets": [
            [
              82,
              86
            ],
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              169
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          ],
          "ref": "1997, Thomas M. Niesen, “Quiet-Water Habitats: Bays, Estuaries, and Lagoons”, in Beachcomber's Guide to Marine Life of the Pacific Northwest, Houston: Gulf Publishing Company, →ISBN, page 73:",
          "text": "Zostera japonica has a strictly intertidal distribution from plus 4.0 to 8.0 feet MLLW. The two species [Z. japonica and Z. marina] overlap between plus 3.3 and 5.0 MLLW[].",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Initialism of mean lower low water"
      ],
      "id": "en-MLLW-en-noun-gbDq67wA",
      "links": [
        [
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          "mean lower low water#English"
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      "tags": [
        "abbreviation",
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        "countable",
        "initialism",
        "uncountable"
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    }
  ],
  "word": "MLLW"
}

{
  "forms": [
    {
      "form": "MLLWs",
      "tags": [
        "plural"
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    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "mean lower low water"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
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        "English uncountable nouns",
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        "en:Oceanography",
        "en:Tides"
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            ],
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          "ref": "1997, Thomas M. Niesen, “Quiet-Water Habitats: Bays, Estuaries, and Lagoons”, in Beachcomber's Guide to Marine Life of the Pacific Northwest, Houston: Gulf Publishing Company, →ISBN, page 73:",
          "text": "Zostera japonica has a strictly intertidal distribution from plus 4.0 to 8.0 feet MLLW. The two species [Z. japonica and Z. marina] overlap between plus 3.3 and 5.0 MLLW[].",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Initialism of mean lower low water"
      ],
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        [
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          "mean lower low water#English"
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  "word": "MLLW"
}