"LH2" meaning in English

{
  "descendants": [
    {
      "lang": "Japanese",
      "lang_code": "ja",
      "roman": "LH2",
      "word": "LH2"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "LH2",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(a liquid composed of the liquid phase of molecular hydrogen (H₂))",
          "word": "liquid hydrogen"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English words spelled without vowels",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
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        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Japanese translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Cryogenics",
          "orig": "en:Cryogenics",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Hydrogen",
          "orig": "en:Hydrogen",
          "parents": [],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "CH2"
        },
        {
          "word": "H2"
        },
        {
          "word": "LHe"
        },
        {
          "word": "LN2"
        },
        {
          "word": "LNG"
        },
        {
          "word": "LO2"
        },
        {
          "word": "LOX"
        },
        {
          "word": "LOx"
        },
        {
          "word": "lox"
        },
        {
          "word": "LPG"
        }
      ],
      "glosses": [
        "Abbreviation of liquid hydrogen (a liquid composed of the liquid phase of molecular hydrogen (H₂))."
      ],
      "id": "en-LH2-en-noun-nGKcb-hs",
      "links": [
        [
          "liquid",
          "liquid#English"
        ],
        [
          "hydrogen",
          "hydrogen#English"
        ],
        [
          "liquid",
          "liquid#English"
        ],
        [
          "liquid phase",
          "liquid phase#English"
        ],
        [
          "hydrogen",
          "hydrogen#English"
        ]
      ],
      "synonyms": [
        {
          "word": "H2(l)"
        }
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "translations": [
        {
          "code": "ja",
          "lang": "Japanese",
          "lang_code": "ja",
          "sense": "abbreviation for liquid molecular hydrogen",
          "word": "LH2 (LH2)"
        }
      ]
    }
  ],
  "word": "LH2"
}

{
  "coordinate_terms": [
    {
      "word": "CH2"
    },
    {
      "word": "H2"
    },
    {
      "word": "LHe"
    },
    {
      "word": "LN2"
    },
    {
      "word": "LNG"
    },
    {
      "word": "LO2"
    },
    {
      "word": "LOX"
    },
    {
      "word": "LOx"
    },
    {
      "word": "lox"
    },
    {
      "word": "LPG"
    }
  ],
  "descendants": [
    {
      "lang": "Japanese",
      "lang_code": "ja",
      "roman": "LH2",
      "word": "LH2"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "LH2",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(a liquid composed of the liquid phase of molecular hydrogen (H₂))",
          "word": "liquid hydrogen"
        }
      ],
      "categories": [
        "English abbreviations",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "English terms spelled with numbers",
        "English words spelled without vowels",
        "Entries with translation boxes",
        "Pages with 2 entries",
        "Pages with entries",
        "Terms with Japanese translations",
        "en:Cryogenics",
        "en:Hydrogen"
      ],
      "glosses": [
        "Abbreviation of liquid hydrogen (a liquid composed of the liquid phase of molecular hydrogen (H₂))."
      ],
      "links": [
        [
          "liquid",
          "liquid#English"
        ],
        [
          "hydrogen",
          "hydrogen#English"
        ],
        [
          "liquid",
          "liquid#English"
        ],
        [
          "liquid phase",
          "liquid phase#English"
        ],
        [
          "hydrogen",
          "hydrogen#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "H2(l)"
    }
  ],
  "translations": [
    {
      "code": "ja",
      "lang": "Japanese",
      "lang_code": "ja",
      "sense": "abbreviation for liquid molecular hydrogen",
      "word": "LH2 (LH2)"
    }
  ],
  "word": "LH2"
}