noun Biochemistry.
any of several phosphatides occurring in animal tissue, especially of the brain, and having marked blood-clotting properties.

1895–1900; cephal- + -in2

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World English Dictionary
cephalin or kephalin (ˈsɛfəlɪn, ˈkɛf-, ˈkɛfəlɪn)
Systematic name: phosphatidylethanolamine a phospholipid, similar to lecithin, that occurs in the nerve tissue and brain
kephalin or kephalin

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American Heritage
Medical Dictionary

cephalin ceph·a·lin (sěf'ə-lĭn) or keph·a·lin (kěf'-)
Any of a group of phospholipids having hemostatic properties and found especially in the nervous tissue of the brain and spinal cord.

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Example sentences
The prothrombin time and kaolin-cephalin time were measured for each blood sample.
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