by–prod·uct 
/ˈbaɪˌprɑ:dəkt/ noun
plural by–prod·ucts /ˈbaɪˌprɑ:dəkt/ noun [count] 1 : something that is produced during the production or destruction of something else — often + of ▪ The chemical is a by-product of the oil-refining process. ▪ Carbon monoxide is a by-product of burning fuel. 2 : something that happens as a result of something else — often + of ▪ The loss of jobs was an unfortunate by-product of the industry's switch to new technology.
