HeelysHeel·ys /ˈhiːliz/ noun [plural] trademark 
shoes with one or more wheels in the heel, so that you can roll along when you want to
shoes with one or more wheels in the heel, so that you can roll along when you want to- Freedom Tower
- free enterprise
- free fall
- free-falling
- free-floating
- Freefone
- underwent
- underwhelm
- underworld
- underwrite
- underwriter
- Underwriters' Laboratories
- undeserved
- undesirable
- undetected
- undeterred
- undeveloped
- undid
- undies
- undifferentiated
- undignified
- undiluted
- undiminished
- undischarged
- undisclosed