noun[mass noun] Biochemistry
- A form of amylase found in the saliva of humans and some other animals.More example sentences
- It begins in the mouth where the enzyme ptyalin, present in saliva, begins to break down starch in food to sugars.
- The saliva of carnivora contains no ptyalin and cannot predigest starches; that of vegetarian animals contains ptyalin for the predigestion of starches.
mid 19th century: from Greek ptualon 'spittle' + -in1.
More definitions of ptyalinDefinition of ptyalin in:
- The US English dictionary