Petri dish

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Petri dish

a shallow circular flat-bottomed dish, often with a fitting cover, used in laboratories, esp for producing cultures of microorganisms
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

petri dish

[′pē·trē ‚dish]
(microbiology)
A shallow glass or plastic dish with a loosely fitting overlapping cover used for bacterial plate cultures and plant and animal tissue cultures.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.