An instrument for recording the capillary blood pressure as shown by the circulation under the nail. ... Origin: onycho-+ G. Grapho, to write ... (05 Mar 2000) ... 
(o-nik´o-graf) an instrument for observing and recording the nail pulse and capillary circulation.
Type: Term Pronunciation: on′i-kō-graf Definitions: 1. An instrument for recording the capillary blood pressure as shown by the circulation under the nail.