Definitions:

1. A detachable lock that can be ued to secure something by means of a sliding or hinged shackle. NOUN
   • The padlock's intricate design defied any attempt to pick it, protecting its precious contents.
2. A portable lock with a shackling mechanism or U-shaped bar that can be passed through an opening, like a latch or chain, to secure doors, gates, lockers, or containers. NOUN
   • The shed was secured with an old padlock and chain.

Synonyms:

• chain lock
• clasp-lock
• lock
• shackle lock