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bull header

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noun Masonry.
  1. Also called bullnose header. a brick having one of the edges across its width rounded for laying as a header in a sill or the like.
  2. a brick laid on edge as a header, as in a rowlock.
Compare bull stretcher.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018