variant of -orama, occurring as the final element in compounds when the first element is disyllabic and does not end in -r, used so that the entire word maintains the same number of syllables as panorama: Cinerama; telerama.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Word Origin and History for -rama
noun suffix meaning "sight, view, spectacular display or instance of," 1824, abstracted from panorama (q.v.), ultimately from Greek horama "sight, spectacle, that which is seen."
Online Etymology Dictionary, © 2010 Douglas Harper