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.
[L. Morpheus, god of dreams or of sleep] /morÂ·phine/ (morÂ´fÄn) an opioid analgesic, the principal and most active alkaloid of opium; used as the sulfate or hydrochloride salt as an analgesic, antitussive, and as an adjunct to anesthesia or to treatment of pulmonary edema secondary to left ventricular failure.