batholith (5) | (noun) - deep + stone = a mass of igneous rock that is a far below the surface. Batholithic is the adjective form. |
bathos (5) | (noun) From the word = the unusual reduction of something from the highest level to something ordinary. |
bathymetry (5) | (noun) deep + measure = the measurement of water depth and other related information. Bathymetric is an adjective form. |
bathyscaph (4) | (noun) deep + boat = an underwater boat used for deep-sea exploration with a round watertight enclosure attached to its bottom. Sometimes spelled bathyscaphe. |
bathysphere (3) | (noun) deep + sphere = a thick walled steel sphere for deep-sea diving and underwater observation. |
bathythermograph (5) | (noun) deep + warm + write = a record of water temperature as a function of depth, or a device to measure it. |
eurybathic (5) | (adj.) broad, wide + depth = able to live in both deep and shallow water. |