batho-, bathy-

(Greek: deep, depth)

bathymeter
1. An instrument for deep-sea sounding or measuring.
2. An instrument for recording contours of deep oceans and seas.
bathymetric biofacies
In geology, the lateral distribution and character of underwater sedimentary strata.
bathymetric chart
A topographic map of the floor of the ocean.
bathymetrical
1. Relating to measurements of the depths of oceans or lakes.
2. A reference to the vertical distribution of organisms in sea.
bathymetry, bathymetric
1. The measurement of the depths of oceans, seas, or other large bodies of water.
2. The data derived from such measurement; especially, as compiled in a topographic map.
3. The process of measuring the depths of sea or oceans.
4. The science of measuring ocean depths in order to determine the sea floor topography.
bathyorographical
A reference to depth underwater and elevation above sea level including mountains.
bathyorography
The study and mapping of variations in the earth's surface, including depths of bodies of water (oceans, lakes, etc.) and mountains and mountain ranges.
bathypelagic
1. The biogeographic realm of the ocean, or living in the depths of the ocean; especially, between about 1000 and 4000 meters (3,280 and 13,120 feet).
2. A reference to creatures living in the bathyal region of an ocean.
3. Found in the depths of the sea.
bathypelagic zone
A layer of the oceanic zone lying below the mesopelagic zone and above the abyssopelagic zone, at depths generally between about 1000 and 4000 meters (3,280 to 13,120 feet).

The bathypelagic zone receives no sunlight and water pressure is considerable. The abundance and diversity of marine life decreases with depth through this and the lower zones.

bathyphile
1. Thriving in lowlands.
2. Thriving in the deep sea to in the depths of the ocean.
bathyphotometer
An instrument for detecting photoluminescent signals in marine environments.

The system uses photodiodes to convert the optical signals into electrical signals which are sampled, integrated, and coupled to output terminals for transmission to a surface host vehicle.

Here is more information about bathyphotometry.

bathyphyll
A leaf at the base of a stem functioning as an attachment to a substrate (layer).
bathyplankton
1. Planktonic organisms that undergo diurnal vertical migration, moving up towards the surface at dusk and down away from the surface at dawn.
2. Plankton that live at a depth below the mesoplankton zone.
3. The plankton in the greater depths of the oceans or seas; especially, of the abyssal zones.
bathypnea
Deep breathing.
bathyscaph, bathyscape, bathyscaphe
1. A self-propelled deep-sea diving submersible, consisting of a crew cabin similar to a bathysphere suspended below a float.
2. A navigable, submersible vessel for exploring the depths of the ocean, having a separate, overhead chamber filled with gasoline for buoyancy and iron or steel weights for ballast.
3. A free-diving vessel used to explore the ocean at great depths.

The original bathyscaphe, constructed in 1948, was made of a cylindrical metal float and a suspended steel ball that could hold two people.

Design improvements allowed the second bathyscaphe in 1960 to descend to a record 10,912 meters (35,791 feet) in the Marianas Trench in the western Pacific Ocean, almost to the deepest level ever sounded on earth.

4. A "diving apparatus for reaching great depths", 1947, name coined by its inventor, Swiss "scientific extremist" Professor Auguste Piccard, from Greek bathys, "deep" + skaphe, "boat".

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).