sul·fo·ni·um 
(sŭl-fōnē-əm)
(sŭl-fōnē-əm)n.
A univalent cation containing trivalent sulfur, such as H3S+.
[SULF(O)- + (AMM)ONIUM.]
- propitiatorily
- propitiatory
- propitious
- propitiously
- propitiousness
- propjet
- proplastid
- propofol
- propolis
- proponent
- proportion
- proportionable
- proportionably
- proportional
- proportionality
- proportionally
- proportional representation
- proportionate
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- proportionateness
- proportioner
- proportionment
- proposal
- propose
- proposer