acidophile

noun2

1. •
   An organism that lives and thrives under acidic conditions; a form of extremophile.

   • The presence of this and other closely related Thermoplasmales suggests that these acidophiles are important contributors to acid mine drainage and may substantially impact iron and sulfur cycles. — 2000
2. •
   A plant that thrives in relatively acid soil.

   • Examples of acid vegetation include specific plant associations dominated by heath, sphagnum moss and many other acidophile plants. — 2005