marine acid air en · NOUN
Meanings
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(historical, uncountable) Hydrogen chloride gas.
His discovery of marine acid air by heating hydrochloric acid solution led him to heat volatile spirit of sal ammoniac (ammonia water), from which he obtained a great quantity of “vapour.”
2004, Robert E Schofield, The Enlightened Joseph Priestley, Pennsylvania State University, published 2004, page 103: