puff ‧ er /ˈpʌfə $ -ər/ BrE AmE noun [countable]
1 . British English informal a small piece of equipment containing medicine which you breathe in through your mouth, to help you breathe more easily SYN inhaler :
Asthma can be made worse by using puffers too often.
2 . a type of tropical fish that can fill itself with air so that it looks almost round