Definition of water pillar:
(n) :
A waterspout (whirlwind).
(n) :
Synonym of water crane.
(n) :
A power-generation mechanism that makes use of the pressure differential created by changing water levels due to tide action, which is used to drive turbines or pumps.
(n) :
A framework or initiative that focuses on water resources in sustainable development and climate action.
(n) :
Used other than figuratively or idiomatically: see water, pillar.; a pillar formed of water.