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n.
anything tall and relatively thin that approximates the shape of a column or tower; "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"
n.
a vertical glass tube used in column chromatography; a mixture is poured in the top and washed through a stationary substance where components of the mixture are adsorbed selectively to form colored bands
n.
a formation of people or things one behind another; "the line stretched clear around the corner"; "you must wait in a long line at the checkout counter"
n.
a formation of people or things one beside another; "the line of soldiers advanced with their bayonets fixed"; "they were arrayed in line of battle"; "the cast stood in line for the curtain call"
n.
a written explanation or criticism or illustration that is added to a book or other textual material; "he wrote an extended comment on the proposal"