ROUNDNESS – 1. The convexity of the profile of the horse’s topline, which is accompanied by concavity of the underline of the neck. 2. The circular (as opposed to linear or flat) quality characterizing the movements, action, or trajectory of the horse’s limbs. 3. Shape of figure (such as a circle).
Full glossary: http://bit.ly/2019USDFGlossary
