sul·fi·nyl 
(sŭlfə-nĭl′)
(sŭlfə-nĭl′)n.
The bivalent group SO. Also called thionyl.
[SULF(O)- + -IN + -YL.]
- superduper
- superego
- supereminence
- supereminent
- supereminently
- supererogate
- supererogation
- supererogative
- supererogatory
- superfamily
- superfast
- super featherweight
- superfecta
- superfecundation
- superfetate
- superfetation
- superficial
- superficiality
- superficially
- superficialness
- superficies
- superfine
- superfineness
- superfluid
- superfluidity