One of the mysteries of the English language finally explained.
A form of amylase found in the saliva of humans and some other animals.
- ‘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’ + -in.
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