Defect (n.) Want or absence of something necessary for completeness or perfection; deficiency; -- opposed to superfluity.

Defect (n.) Failing; fault; imperfection, whether physical or moral; blemish; as, a defect in the ear or eye; a defect in timber or iron; a defect of memory or judgment.

Defect (v. i.) To fail; to become deficient.

Defect (v. t.) To injure; to damage.