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Douglas Harper's Etymology Dictionary
acidophilus

1920, used of milk fermented by acidophilic bacteria, from acidophil (1900), a hybrid word, from Latin acidus "acidic" (see acid (adj.)) + Greek philos "loving" (see -phile); the bacteria so called because they stain easily with an acid dye.

Wiktionary
acidophilus

n. 1 A nickname for Lactobacillus acidophilus, one of the bacteria commonly used in fermenting yogurt. 2 The “good bacteria” found naturally in the human stomach and intestines.

WordNet

Usage examples of "acidophilus".

Or you can take acidophilus in supplement form of 20 milligrams twice daily.

How it could be so close to certain of not killing acidophilus and other helpful bacteria in our digestive systems?

Obviously these things should be avoided but I have found in many cases that Acidophilus and Pectin tablets between meals and Papaya Enzyme with meals negate the bad effects of these foods.

I recommend two tablets of Papaya Enzyme with meals and two tablets of Acidophilus and Pectin between meals.