Definition of ptyalin in English:

ptyalin

noun

Biochemistry
  • [mass noun] 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

/ˈtʌɪəlɪn/