Dogtooth \Dog"tooth`\, n.; pl. {Dogteeth}. 1. See {Canine tooth}, under {Canine}. [1913 Webster] 2. (Arch.) An ornament common in Gothic architecture, consisting of pointed projections resembling teeth; -- also called {tooth ornament}. [1913 Webster] {Dogtooth spar} (Min.), a variety of calcite, in acute crystals, resembling the tooth of a dog. See {Calcite}. {Dogtooth violet} (Bot.), a small, bulbous herb of the Lily family (genus {Erythronium}). It has two shining flat leaves and commonly one large flower. [Written also {dog's-tooth violet}.] [1913 Webster]