n. A graduated microscope slide or similar small vessel used for counting or measuring cells
n. An automated device used for the same purpose
The Century Dictionary and Cyclopedia
n. Any device used in counting cells: employed frequently in the special sense of hemacytometer.
Word Usage
"Specifically, the flow cytometer told Gilbert that in the mice exposed to TCE, a T-cell activation molecule, CD44, was acting differently than it would have if there had been no autogen."