Merriam-Webster Collegiate Dictionary - canine

 I. noun  Date: 15th century  1. Middle English, from Latin (dens) caninus ~ tooth a conical pointed tooth; especially one situated between the lateral incisor and the first premolar — see tooth illustration  2. dog 1a; broadly canid  II. adjective  Etymology: Latin caninus, from canis dog — more at hound  Date: 1607  1. of or resembling that of a dog ~ loyalty  2. of or relating to dogs or to the family (Canidae) including the canids