In bacteriology, having complex nutritional requirements.
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fas·tid·i·ous fa-'stid-ē-əs, fə- adj having complex nutritional requirements <\fastidious microorganisms> used of bacteria that grow only in specially fortified artificial culture media
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fas·tid·i·ous (fas-tidґe-əs) in bacteriology, a microorganism having complex nutritional or cultural requirements for growth.Medical dictionary. 2011.