both refer to movie chains (i.e., Loews, AMC Theatres) with movie theatres that screen more than one film at a time, as opposed to single-screen theatres. A multiplex has from 2 up to 16 screens, a megaplex has 16 or more screens; plex is the abbreviation for a multiplex theatre.
A morula (Latin, morus: mulberry) is an early stage embryo consisting of cells (called blastomeres) in a solid ball contained within the zona pellucida.
(also palatine uvula), a cone-shaped extension of the soft palate in humans and some anthropoid apes. The uvula departs from the middle of the posterior margin of the palate and proceeds with the apex downward. It is covered by a mucous membrane. The anterior side of the uvula faces the mouth, and the posterior side the nasopharynx.