Exsiccate means to remove moisture and make something dry. Some antonyms of exsiccate are hydrate, moisten, wet, and irrigate. Hydrate means to add moisture to something that is dry or dehydrated, moisten means to make something slightly wet, wet means to drench something completely, and irrigate means to water something by artificial means. These antonyms are opposite to exsiccate as they involve adding moisture instead of taking it away. While exsiccate is mostly associated with drying and dehydrating, these antonyms bring to mind images of replenishing and rejuvenating something.