defect
/ˈdē-ˌfekt/
noun
an imperfection or abnormality that impairs quality, function, or utility : shortcoming, flaw
an imperfection (such as a vacancy or an unlike atom) in a crystal lattice
carefully inspect a tire for defects
verb
to forsake one cause, party, or nation for another often because of a change in ideology
to leave one situation (such as a job) often to go over to a rival
a former KGB agent who defected to America
noun
a physical or biochemical defect that is present at birth and may be inherited or environmentally induced