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bull header

noun
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Definition of bull header

: a header brick laid on its edge also : a brick having one of its corners rounded, laid with one of its ends exposed, and serving as the sill under and beyond a window frame, as a quoin, or as a part of the masonry around a doorway

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“Bull header.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bull%20header. Accessed 30 May. 2020.

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