Definition of ptyalin in US English:

ptyalin

noun

Biochemistry
  • A form of amylase found in the saliva of humans and some other animals.

    • ‘The saliva of carnivora contains no ptyalin and cannot predigest starches; that of vegetarian animals contains ptyalin for the predigestion of starches.’
    • ‘It begins in the mouth where the enzyme ptyalin, present in saliva, begins to break down starch in food to sugars.’

Origin

Mid 19th century: from Greek ptualon ‘spittle’ + -in.

Pronunciation

ptyalin

/ˈtīələn//ˈtaɪələn/