[ suhl-foh ]
/ ˈsʌl foʊ /
Save This Word!

adjective Chemistry.
containing the sulfo group; sulfonic.
In effect, this quiz will prove whether or not you have the skills to know the difference between “affect” and “effect.”
Question 1 of 7
The rainy weather could not ________ my elated spirits on my graduation day.
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of sulfo

Shortening of sulfonic or sulfonyl

Other definitions for sulfo (2 of 2)


variant of sulf-, especially before a consonant: sulfocarbanilide.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022


What does sulfo- mean?

The combining form sulfo- is used like a prefix meaning “sulfur,” a nonmetallic element known for its distinctive odor. This form is used in a few scientific terms, especially in chemistry.

The form sulfo- comes from Latin sulfur, meaning both “sulfur” and “brimstone.”

What are variants of sulfo-?

The form sulfo- is a variant of sulf-, which gains an -o- when combined with words or word elements beginning with consonants. In British English, sulfo- is spelled sulph- or sulpho-, as in sulphide. Want to know more? Read our Words That Use articles for these combining forms.

Examples of sulfo-

One example of a scientific term that features the form sulfo- is sulfotransferase, “an enzyme that catalyzes the transfer of a sulfate group from one compound to the hydroxyl group of another.”

The word sulfotransferase is made of three parts: sulfo- + transfer + -ase. The sulfo- part of the word means “sulfur,” while the suffix -ase is used to name enzymes. Sulfotransferase literally means “sulfur-transfer(ing) enzyme.”

What are some words that use the combining form sulfo-?

What are some other forms that sulfo- may be commonly confused with?

Break it down!

Salicylic acid is a white, crystalline, very slightly water-soluble powder with a number of commercial applications. Keeping in mind the meaning of sulfo-, what is a property of sulfosalicylic acid?

Medical definitions for sulfo


The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.