aromatogram (er·ō·matˑ·ō·gram),

n a test used to determine the antibacterial activity of essential oils in which the oil is introduced into the center of a bacteria-laden petri dish. A clear zone indicates the bactericidal activity of the oil. The greater the diameter of the zone, the higher the efficacy of the oil.
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The same type of microbe appearing in different tests in contact with essential oils is affected differently in each aromatogram.