Linctus
/ˈlɪŋktəs/
Definition 1 of 1
Pro Tip 1/3Cough Relief
Linctus is specifically for coughs. Don't use it for other symptoms like a runny nose or fever. 
He took a linctus to ease his coughing, not his headache.
Pro Tip 2/3Medical Context
Linctus is more common in medical settings or when speaking with healthcare professionals. 
The nurse said a linctus would help with my cough.
Pro Tip 3/3Oral Medication
'Taken by mouth' means you swallow it. Don't confuse it with medicines applied on the skin. 
The instructions said to swallow the linctus, not rub it on the throat.