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sulf-

1.
a combining form representing sulfur, in compound words:
sulfarsphenamine.
Also, sulfo-; especially British, sulph-.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sulf-

sulf-

combining form
1.
a US variant of sulph-

sulph-

combining form
1.
containing sulphur: sulphate, sulphonic acid
Usage note
The ``ph'' spelling of sulphur and related words is used in British English. In the US the spelling is sulfur. However, the recommended spelling in chemistry is sulfur and this is found in technical writing. Also the sulf- spelling is used in the names of generic drugs
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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