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From The Collaborative International Dictionary of English v.0.48:
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]