sialagogue
Concise Oxford English Dictionary © 2008 Oxford University Press:
sialagogue /ˈsʌɪələgɒg/
▶noun Medicine a drug that promotes the secretion of saliva.
– origin C18: from Fr., from Gk sialon ‘saliva’ + agōgos ‘leading’.
'sialagogue' also found in these Oxford entries:

