pro·tho·rax 
(prō-thôrăks′)
(prō-thôrăks′)n. pl. pro·tho·rax·es or pro·tho·ra·ces (-thôrə-sēz′)
The anterior division of the thorax of an insect, bearing the first pair of legs.
pro′tho·racic (-thə-răsĭk) adj.
- ultraliberal
- ultralight
- ultralow frequency
- ultraluxe
- ultramafic
- ultramarathon
- ultramarathoner
- ultramarine
- ultramicrometer
- ultramicroscope
- ultramicroscopic
- ultramicroscopy
- ultramicrotome
- ultramicrotomy
- ultraminiature
- ultraminiaturization
- ultraminiaturize
- ultramodern
- ultramodernism
- ultramodernist
- ultramodernistic
- ultramontane
- ultramontanism
- ultramontanist
- ultramundane