/bath"euh skayf', -skaf'/ , n. Oceanog.
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.
Also, bathyscaph /bath"euh skaf'/ , bathyscape /bath"euh skayp'/ .
[ 1947; bathy- BATHY- + Gk skáphos ship; coined by Auguste Piccard ]