A monorail is a rail-based transportation system based on a single rail, which acts as its sole support and its guideway. The term is also used variously to describe the beam of the system, or the vehicles traveling on such a beam or track. The term originates from the contraction of the words mono (single) and rail, from as early as 1897 as early systems used metal rails.
OmegaWiki Dictionary
Ω
monorail A rail-based transportation system based on a single rail.