{
    "term": "hydrogen",
    "partOfSpeech": "noun",
    "ox5000": true,
    "cefr": "c1",
    "definitions": [
        {
            "senseNumber": null,
            "definition": "a chemical element. Hydrogen is a gas that is the lightest of all the elements. It combines with oxygen to form water.",
            "examples": [],
            "topics": ["Physics and chemistry"]
        }
    ],
    "pronunciations": {
        "uk": [
            {
                "pronunciation": "/ˈhaɪdrədʒən/",
                "audio": "hy/hydrogen/hydrogen__gb_1.mp3"
            }
        ],
        "us": [
            {
                "pronunciation": "/ˈhaɪdrədʒən/",
                "audio": "hy/hydrogen/hydrogen__us_1.mp3"
            }
        ]
    },
    "wordOrigin": "late 18th cent.: coined in French from Greek hudro- ‘water’ + -genēs ‘-born, of a specified kind’, from gen- (root of gignomai ‘be born, become’, genos ‘a kind’)."
}