[{"Bold_text": "noun", "List Items": ["any of a class of compounds containing chemically combined water. In the case of some hydrates, as washing soda, Na2CO3?10H2O, the water is loosely held and is easily lost on heating; in others, as sulfuric acid, SO3?H2O, or H2SO4, it is strongly held as water of constitution."]}, {"Bold_text": "verb (used with or without object)", "List Items": ["to combine chemically with water."]}, {"Bold_text": "Noun", "List Items": null}, {"Bold_text": "Verb", "List Items": null}]