A cell family or group of common origin, mostly of unicellular organisms, esp. among the lower algæ. They may adhere in chains or groups, or be held together by a gelatinous envelope.
a group of microorganisms originating as the descendents of one individual cell, growing on a gelled growth medium, as of gelatin or agar; especially, such a group that has grown to a sufficient number to be visible to the naked eye.
A population of cells growing on solid medium (plates) arising from a single colony forming unit.