
In microbiology, colony-forming unit (CFU) is a rough estimate of the number of viable bacteria or fungal cells in a sample. Viable is defined as the ability to multiply via binary fission under the controlled conditions. In contrast in a microscopic evaluation, all cells, dead and living are counted. The visual appearance of a colony in a cell cu...
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http://en.wikipedia.org/wiki/Colony-forming_unit

<cell biology> An individual cell which is able to clone itself into an entire colony of identical cells. ... Irradiated mice can have their immune systems reconstituted by the injection of bone marrow cells from a nonirradiated animal. The injected cells form colonies in the spleen (hence s), each colony representing the progeny of a pluripo...
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http://www.encyclo.co.uk/local/20973

(= CFU-S) Irradiated mice can have their immune systems reconstituted by the injection of bone marrow cells from a non-irradiated animal. The injected cells form colonies in the spleen (hence -S), each colony representing the progeny of a pluripotent stem cell. Operationally, therefore, the number of colony-forming units is a measure of the number of stem cells.
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http://www.encyclo.co.uk/visitor-contributions.php

Type: Term Definitions: 1. a unit of cells in bone marrow capable of generating or increasing the proliferation of new blood cells.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=95677

a counting quantity represented by a colony formed on solid medium from a single cell or a few cells
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https://courses.lumenlearning.com/microbiology/chapter/glossary/
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