ptyalin /tīˈə-lin or ptīˈə-lin/

A ferment in saliva that turns starch into sugar

ptyalagogic /-ə-gojˈik or -gogˈik/ adjective

ptyalagogue /-alˈə-gog/ noun (medicine)

A sialagogue

• on and on
• on and on and on
• on an even keel
• onanism
• onanisms
• onanist
• onanistic
• onanists
• on another planet
• on a par with
• on a plate
• on appro
• on approbation
• on approval
• on a roll
• on a shoestring
• on a small scale
• on a string
• on a time
• on average
• on a wing and a prayer
• on bail
• on balance
• on behalf of
• on bended knee