Meaning of bull stretcher

bull' stretch"er

Pronunciation: [key]
— Masonry. Masonry.
  1. Also calleda brick having one of the edges along its length rounded for laying as a stretcher in a sill or the like.
  2. a brick laid on edge as a stretcher. Cf. bull header.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.