Science, Tech, Math › Science Aryl Group Definition in Chemistry Share Flipboard Email Print Andrew Brookes / Getty Images Science Chemistry Chemical Laws Basics Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated August 11, 2019 An aryl group is a functional group derived from a simple aromatic ring compound where one hydrogen atom is removed from the ring. Usually, the aromatic ring is a hydrocarbon. The hydrocarbon name takes the -yl suffix, such as indolyl, thienyl, phenyl, etc. An aryl group is often simply called an "aryl". In chemical structures, the presence of an aryl is indicated using the shorthand notation "Ar". This is also the same as the symbol for the element argon but doesn't cause confusion because it's used in the context of organic chemistry and because argon is a noble gas, and thus inert. The process of attaching an aryl group to a substituent is called arylation. Examples: The phenyl functional group (C6H5) is an aryl functional group derived from benzene. The napththyl group (C10H7) is the aryl group derived from naphthalene.