Chem.
a reaction in which part of a compound is added to one end of a double or triple bond, while the rest adds to the other end, converting it, respectively, to a single or double bond.
Chem.
a reaction in which part of a compound is added to one end of a double or triple bond, while the rest adds to the other end, converting it, respectively, to a single or double bond.
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012