Arch. [dim. of CHAPTER in sense of CHAPITER: see -EL.] The capital of a pier or pilaster supporting the springing of an arch; an impost.
1677. Moxon, Mech. Exerc. (1703), 279. If you will add a Keystone, and Chaptrels to the Arch … make your Chaptrels the same thickness that … the Keystone is.
1751. Halfpenny, Designs Chinese Doors, III. 3. From the lower Line of the Plinth, to the upper Line of the Chaptrel.
