| (n.) | The general and popular term for a firm, upright, insulated support for a superstructure; a pier, column, or post; also, a column or shaft not supporting a superstructure, as one erected for a monument or an ornament. |
| (n.) | Figuratively, that which resembles such a pillar in appearance, character, or office; a supporter or mainstay; as, the Pillars of Hercules; a pillar of the state. |
| (n.) | A portable ornamental column, formerly carried before a cardinal, as emblematic of his support to the church. |
| (n.) | The center of the volta, ring, or manege ground, around which a horse turns. |
| (a.) | Having a support in the form of a pillar, instead of legs; as, a pillar drill. |