A·ra·guaí·a or A·ra·gua·ya 
(är′ə-gwīə)
(är′ə-gwīə) A river rising in central Brazil and flowing about 2,115 km (1,315 mi) generally northward to the Tocantins River. There are numerous falls on the river.
- ultrasonogram
- ultrasonograph
- ultrasonographer
- ultrasonographic
- ultrasonography
- ultrasophisticated
- ultrasound
- ultrastructure
- ultrathin
- ultraviolet
- ultraviolet astronomy
- ultraviolet dropout
- ultraviolet photoemission spectroscopy
- ulu
- Ulugh Muztagh
- ululant
- ululate
- ululation
- Uluru
- Uluru
- Ulyanovsk
- Ulysses
- Ulysses Simpson
- um
- umami