The feeling you get when you see or smell something really gross is an example of disgust.
When you cause someone to be really grossed out, this is an example of a time when you disgust him.
Origin of disgust
- Late Old French desgouster to lose one's appetite des- dis- gouster to eat, taste (from Latin gustāre geus- in Indo-European roots)
From American Heritage Dictionary of the English Language, 5th Edition
- From Old French desgouster (“to put off one's appetite”), from des- (“dis-”) + gouster, goster (“to taste”), from Latin gustus (“a tasting”).