Final answer:
Hydrous lanolin is a water-in-oil ointment base used in moisturizers.
Step-by-step explanation:
Hydrous lanolin is an example of an ointment base used in moisturizers. Ointment bases are substances that are used to create a vehicle or carrier for active ingredients in topical medications or skincare products. Hydrous lanolin is a water-in-oil ointment base, which means it contains water dispersed in oil.