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.
Full Definition of MORPHINE. : a bitter crystalline addictive narcotic base C17H19NO3 that is the principal alkaloid of opium and is used in the form of a soluble salt (as a hydrochloride or a sulfate) as an analgesic and sedative.