The Collaborative International Dictionary of English v.0.48:

obelisk \ob"e*lisk\ ([o^]b"[e^]*l[i^]sk), n. [L. obeliscus, Gr.
   'obeli`skos, dim. of 'obelo`s a spit, a pointed pillar: cf.
   F. ob['e]lisque.]
   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.
      [1913 Webster]

   2. (Print.) A mark of reference; -- called also dagger
      [[dagger]]. See Dagger, n., 2.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dagger \Dag"ger\, v. t.
   To pierce with a dagger; to stab. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dagger \Dag"ger\, n. [Perh. from diagonal.]
   A timber placed diagonally in a ship's frame. --Knight.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dagger \Dag"ger\ (-g[~e]r), n. [Cf. OE. daggen to pierce, F.
   daguer. See Dag a dagger.]
   1. A short weapon used for stabbing. This is the general
      term: cf. Poniard, Stiletto, Bowie knife, Dirk,
      Misericorde, Anlace.
      [1913 Webster]

   2. (Print.) A mark of reference in the form of a dagger
      [[dagger]]. It is the second in order when more than one
      reference occurs on a page; -- called also obelisk.
      [1913 Webster]

   Dagger moth (Zool.), any moth of the genus Apatalea. The
      larv[ae] are often destructive to the foliage of fruit
      trees, etc.

   Dagger of lath, the wooden weapon given to the Vice in the
      old Moralities. --Shak.

   Double dagger, a mark of reference [[dag]] which comes next
      in order after the dagger.

   To look daggers, or To speak daggers, to look or speak
      fiercely or reproachfully.
      [1913 Webster]

WordNet (r) 3.0 (2006):

dagger
    n 1: a short knife with a pointed blade used for piercing or
         stabbing [syn: dagger, sticker]
    2: a character used in printing to indicate a cross reference or
       footnote [syn: dagger, obelisk]