Hematocrit is a blood test that measures the percentage of the volume of whole blood that is made up of red blood cells. This measurement depends on the number of red blood cells and the size of red blood cells.
Definition of profound for Students. 1  1 : having or showing great knowledge and understanding a profound thinker. 2  2 : very deeply felt profound sorrow.
Contribute to our Open Dictionary. 1  1. very great a profound change in the climate of the Earth. 2  2. showing serious thought and wise ideas Kafkaâs profound insights into human experience. 3  3. very severe profound deafness.  4. literary deep Synonyms and related words.