1. Pertaining to the ability to exist in an environment that is typically poor in nutrients or which has a high proportion of silica or quartz: Some acidophilousbacteria thrive well in acidic conditions.
2. Characterizing genetic individuals which can only thrive in conditions which are very sour or bitter: It is interesting to know that acidophilous bacteria, known as Lactobacillus, are normally present in yogurt!