cy·tom·e·try 
(sī-tŏmĭ-trē)
(sī-tŏmĭ-trē)n.
The counting and measuring of cells, especially the counting and analysis of cell size, morphology, and other characteristics, traditionally performed using a standardized glass slide or small glass chamber of known volume.
cy′to·metric (-tə-mĕtrĭk) adj.
- on the money
- on the move
- on the nose
- on the off chance
- on the onehand
- on the order of
- on the other hand
- on the outs
- on the part of
- on the prowl
- on the qui vive
- on the rack
- on the rag
- on-the-record
- on the right foot
- on the road
- on the rocks
- on the ropes
- on the run
- on the same wavelength
- on-the-scene
- on the shelf
- on the side
- on the sly
- on the spectrum