A detached column for support, of any shape; a supporter; a monument; something resembling a pillar; foundation or support.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (noun) (n.) (noun)
A column to support a structure or to serve as a monument; any firm, slender, upright support.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (noun) (n.) (noun)
A column of any shape to support; anything that sustains or upholds; a foundation; a support.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (noun) (n.) (noun)
( arch.) A detached support, differing from a column in that it is not necessarily cylindrical, or of classical proportions: anything that sustains.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (noun) (n.) (noun)
A column; support.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (noun) (n.) (noun)

Usage examples:

My young chief was already a breathing pillar of blankets.
- Notes of a Camp-Follower on the Western Front by E. W. Hornung
Once inside the house he crouched in the shade of a pillar and waited until another ghoul joined him in the same manner.
- The Great Mogul by Louis Tracy
For the spirit of romance, which is an eternal though elusive thing, was surely taking fresh hold on him this evening as his pillar of cloud by day and of fire by night, and only Miner Hobbs, the little wooden figure of a man seated several tables off, was yet aware of his friend's exalted state.
- The Loves of Ambrose by Margaret Vandercook