flow cytometry

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Cytometry performed by suspending cells in a liquid and passing them through a light beam, often after applying fluorescent stains. The measured characteristics of the scattered light correlate with cell properties such as volume, morphology, and pigmentation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biology A technique used to sort and classify cells by using fluorescent markers on their surface