Definitions

1. adjective

relating to or caused by smoke or other substances that are in the air after something has burned, or that are left behind by smoke or other substances

“The thirdhand smoke from the neighbor’s barbecue was causing health concerns for the family.”

2. noun

smoke or other substances that are in the air after something has burned, or that are left behind by smoke or other substances

“The thirdhand smoke from the old factory polluted the entire city.”

3. noun

information about something that is obtained indirectly, especially from a secondary source

“The news report contained thirdhand information about the accident.”