Once a bug / defect is found in a software application, it undergoes various stages which forms a defect life cycle.

The stages can be as listed below.

1) Open (Once the defect is found)

2) Fixed (Once the developer provides a fix for the defect)

3) Closed (Once the tester confirms after verification that the issue is resolved)

4) Reopen (If the issue is not resolved, the defect can be reopened)

The above stages vary from organisation to organisation.

This is trisomy 21 i.e. Downs syndrome

A defective product has a defect:

"My phone is defective"

"What defect does it have?"

"The defect is that the screen is broken"

To defect can also mean to switch sides e.g. from an army or a political party

Depends, what defect?

No. The platypus does not have a growth defect.