pillar
noun
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(architecture) a tall vertical cylindrical structure standing upright and used to support a structurecolumn
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a vertical cylindrical structure standing alone and not supporting anything (such as a monument)column
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a fundamental principle or practice“science eroded the pillars of superstition”
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a prominent supporter“They are a pillar of the community.”mainstay
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anything that approximates the shape of a column or towercolumn