From The Collaborative International Dictionary of English v.0.48 [gcide]:
6. (Bot.) A cell family or group of common origin, mostly of unicellular organisms, esp. among the lower alg[ae]. They may adhere in chains or groups, or be held together by a gelatinous envelope. [PJC]
9. (Microbiology) 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. [PJC]
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