Final answer:
A cream is the dosage form that is categorized as a semisolid oil-in-water emulsion, designed for easy application and cosmetic acceptability.
Step-by-step explanation:
The dosage form that is a semisolid oil-in-water emulsion is a cream. Creams are formulations designed to be spread easily and are typically less greasy due to their composition. They are more cosmetically acceptable and can be easily washed off with water. On the other hand, lotions are also typically oil-in-water emulsions but are of a lower viscosity meant for easier application over large areas of the skin.
Ointments while semisolid, are generally more viscous and do not usually consist of emulsions but rather a homogenous, greasy base. Gels different still, have a jelly-like consistency and may or may not be emulsions, depending on their ingredients.