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dermatograph

noun
der·​mat·​o·​graph | \ (ˌ)dərˈmatəˌgraf, ˈdərmətə-\

Definition of dermatograph

: an instrument for producing markings on the skin: such as
a : a crayon used by surgeons to outline internal organs on the body surface sketch the outline of the liver with a dermatograph on the abdominal skin
b : a crayon used to test for allergies

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History and Etymology for dermatograph

dermat- + -graph

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