Webster
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Webster’s Revised Unabridged Dictionary · 1913

Air shaft

Air′ shaft′. A passage, usually vertical, for admitting fresh air into a mine or a tunnel.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek set in Greek letters; entries of one spelling made one article.