Definition: (architecture) a tall vertical cylindrical structure standing upright and used to support a structure
Definition: a vertical cylindrical structure standing alone and not supporting anything (such as a monument)
Main entry: pillar
Definition: a fundamental principle or practice
Usage: science eroded the pillars of superstition
Definition: a prominent supporter
Usage: he is a pillar of the community
Main entry: tower, pillar, column
Definition: anything that approximates the shape of a column or tower
Usage: the test tube held a column of white powder; a tower of dust rose above the horizon; a thin pillar of smoke betrayed their campsite