Egg-cup n. : A cup used for holding an egg, at table.

Example:
What is the most creative use you can think of for two of the little egg cup things from an egg carton?

Taxonomy
egg cup, the egg, free encyclopedia, egg, portion, cup, collectors, container, search, server, shell, raise, stability, informally, footies, pedestal, wood, Cup International.

Defination from the web:
cup known as "buckets" and egg-sized on one side and bigger on the other end known as "doubles" ... of Cretan Knossos reveals the presence of eggshell cup use as early as the 18th century BC. Egg cups have many shapes and bear various designs. ...