the world > animals > mammals > group Ungulata (hoofed) > family Equidae (general equines) > body or parts of horse > [adjective] > having particular type of mouth
well-moutheda1425
smooth-mouthed1974
1752 J. HillGen. Nat. Hist. III. 154 The yellow, gibbose, smooth-mouthed Porcellana.
1974 H. S. ThomasHorses x. 183 At age nine the cusps are gone from the corner incisors. The horse is said to be smooth-mouthed.