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The Collaborative International Dictionary
Dagger moth

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.

  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.

    Dagger moth (Zo["o]l.), 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.

Wiktionary
dagger moth

n. Any of various noctuid moths of the genus ''Acronicta'', having black dagger-shaped markings on the forewings.