( bond) Compare with sigma bond .In the valence bond theory , a pi bond is a valence bond formed by side-by-side overlap of p orbitals on two bonded atoms. In most multiple bonds, the first bond is a sigma bond and all of the others are pi bonds.
PI BOND
Meaning of PI BOND in English
General chemistry English glossary. Английский глоссарий общей химии. 2012