pipsyl
/ˈpɪpsʌɪl/ /ˈpɪpsɪl/(also PIPSYL) Chemistry
noun
The radical p-iodophenylsulphonyl, I—C6H4SO2, compounds of which are used as radioactive labels. Usually attributive.
Origin
1940s; earliest use found in Journal of the American Chemical Society. From p + the initial letters of iodo- and phenyl + s- and -yl.