noun Biochemistry.
an enzyme in the saliva that converts starch into dextrin and maltose.
Also called salivary amylase.

1835–45; < Greek ptýal(on) spittle, saliva + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ptyalin (ˈtaɪəlɪn)
biochem an amylase secreted in the saliva of man and other animals
[C19: from Greek ptualon saliva, from ptuein to spit]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

ptyalin pty·a·lin (tī'ə-lĭn)
An amylase present in saliva that catalyzes the hydrolysis of starch into maltose and dextrin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
ptyalin   (tī'ə-lĭn)  Pronunciation Key 
An enzyme found in the saliva of humans and herbivorous animals that helps in the predigestion of starches. Ptyalin is a type of amylase.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Starches are partially digested in the mouth by ptyalin-containing saliva, which is an alkaline compounds.
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