onychograph
(ŏn′ĭ-kō-grăf′, ō-nĭk′ə-grăf′, ŏ-nĭk′-)- An instrument for recording the capillary blood pressure as shown by the circulation under a fingernail or toenail.
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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.