Cata-

• biology

1. down
   Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby

• geology

1. A prefix to indicate that the rock belongs to the deepest zone of metamorphism, which is characterized by very high temperature, hydrostatic pressure, and relatively low shearing stress. CF: epi-; meta-; meso-. Syn: kata-
   Source: Dictionary of Mining, Mineral, and Related Terms