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From 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]