tran·son·ic 
(trăn-sŏnĭk)
(trăn-sŏnĭk)adj.
Of or relating to aerodynamic flow or flight conditions at speeds near the speed of sound.
[TRAN(S)- + SONIC.]
- superdelegate
- superdense
- superdominant
- superduper
- superego
- supereminence
- supereminent
- supereminently
- supererogate
- supererogation
- supererogative
- supererogatory
- superfamily
- superfast
- super featherweight
- superfecta
- superfecundation
- superfetate
- superfetation
- superficial
- superficiality
- superficially
- superficialness
- superficies
- superfine