noun

1. a mark or flaw that spoils the appearance of something (especially on a person's body)

e.g. a facial blemish

Synonym: blemishmar

2. a failing or deficiency

e.g. that interpretation is an unfortunate defect of our lack of information

Synonym: shortcoming

3. an imperfection in a bodily system

e.g. visual defects
this device permits detection of defects in the lungs

4. an imperfection in an object or machine

e.g. a flaw caused the crystal to shatter
if there are any defects you should send it back to the manufacturer

Synonym: faultflaw