A microorganism which grows best (or can only grow) in high-pressure environments, such as deep-sea environments. ... (09 Oct 1997) ... 
barophile An organism that thrives under conditions of high hydrostatic or atmospheric pressure.barophilic, barophile, barophily In biology, thriving under conditions of high hydrostatic or atmospheric pressure; tolerant of weight, said particularly of bacteria growing at great depths in the ocean.
organism that grows under high atmospheric pressure