单词	ptyalin
释义	ptyalin /ˈtʌɪəlɪn / noun [mass noun] Biochemistry 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. Origin Mid 19th century: from Greek ptualon 'spittle' + -in1.
随便看	quatercentenary quatercentennial quatern quaternarian quaternary quaternary compound quaternary number quaternary structure quaternate to match tomatillo tomatin tomatine tomato tomatoey tomb Tombaugh, Clyde William Tombigbee River tombola tombolo Tombouctou tomboy tomboyish tomboyishly tomboyishness

英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。