Science, Tech, Math › Science Electrophile Definition Share Flipboard Email Print 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. Updated March 08, 2017 Definition: An electrophile is an atom or molecule that accepts an electron pair to make a covalent bond. Also Known As: Lewis acid Examples: H+ is an electrophile. It can accept a pair of electrons from the Lewis base OH- to form H2O. Continue Reading