1. An upright, four-sided pillar, gradually tapering as it rises, and terminating in a pyramid called pyramidion. It is ordinarily monolithic. Egyptian obelisks are commonly covered with hieroglyphic writing from top to bottom.
  2. A mark of reference; -- called also dagger [/]. See Dagger, n., 2.

v. t.

  1. To mark or designate with an obelisk.