mon·o·rail 
(mŏnə-rāl′)
(mŏnə-rāl′)n.
1. A single rail serving as a track for wheeled vehicles traveling on it or suspended from it.
2. A railway system using a single rail.
monorailSydney, Australia
- openhearted
- openheartedly
- openheartedness
- open-hearth
- open-heart surgery
- open house
- opening
- open interval
- open-label
- open letter
- open listing
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- openly
- open market
- open marriage
- open meeting law
- open mike
- open-minded
- open-mindedly
- open-mindedness
- open-mouthed
- open-mouthedly
- openness
- open (one's) eyes
- open one's eyes