An instrument for counting the red blood cells; Hayden used this term to denote an instrument to measure the diameter of red blood cells. ... Origin: erythrocyte + G. Metron, measure ... (05 Mar 2000) ... 
Type: Term Pronunciation: ĕ-rith′rō-sī-tom′ĕ-tĕr Definitions: 1. An instrument for counting the red blood cells; Hayden used this term to denote an instrument to measure the diameter of red blood cells.
an apparatus used for counting red blood cells.