Presenilin Definition
    noun
  
 (biochemistry) Any of a class of transmembrane proteins.
Wiktionary 
Other Word Forms of Presenilin
Noun
Singular:
 presenilinPlural:
 presenilinsOrigin of Presenilin
-  presenile + -in, since they were first identified in screens for mutations causing early onset forms of familial Alzheimer's disease. From Wiktionary 
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