Dictionary of Human Evolution and Biology

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Wax-like substance secreted by glands that line the external ear canal. The functional purpose of cerumen may be to trap insects that enter the ear. Cerumen is inherited as a simple Mendelian trait and is polymorphic with a yellow waxy variety (dominant) and a gray dry variety. Frequencies of the two varieties of cerumen vary in human populations. Aka earwax.

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From "Dictionary of Nursing and Individual Health Care"