batho-, bathy-

(Greek: deep, depth)

bathyseism
1. Any earthquake that happens at great depth.
2. An earthquake of deep origin recordable at seismographic stations around the world.
bathysmal
Pertaining to the depths of the ocean.
bathysophical (adjective), more bathysophical, most bathysophical
A reference to a knowledge of deep-sea life and conditions.
bathysphere (s) (noun), bathyspheres (pl)
A round watertight diving chamber with observation windows: A bathysphere was usually lowered by cables from a ship and it was formerly used to study deep-sea life.

The bathysphere is also described as a circular tethered metal compartment with an inside diameter of less than three feet in which the deep-sea pioneers cramped themselves for several hours during each immersion.

A kind of diving globe or ball for deep-sea observations.
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bathythermogram
The record that is made by a bathythermograph (an instrument that records water temperature in relation to ocean depth).
bathythermosphere
1. A device for obtaining a record of temperature against depth (pressure) in the ocean from a ship that is underway or in motion.
2. An instrument for recording water temperature as compared to depth.
bathyvessel
A ship; such as, a bathysphere or submarine, designed to operate far below the surface of the water.
isobathytherm
1. A line connecting the points on the surface of the earth where a certain temperature is found at the same depth.
2. A line or surface showing the depths in oceans or lakes at which points have the same temperature.

Isobathytherms are usually drawn to show cross sections of the water mass.

Inter-related cross references, directly or indirectly, involving the "sea" and the "ocean" bodies of water: abysso- (bottomless); Atlantic; bentho- (deep, depth); halio-, halo- (salt or "the sea"); mare, mari- (sea); necto-, nekto- (swimming); oceano-; pelago- (sea, ocean); plankto- (drifting); thalasso- (sea, ocean).