Definition of "hydrofluoric acid" []

• A colorless, fuming, corrosive, dangerously poisonous aqueous solution of hydrogen fluoride, HF, used to etch or polish glass, pickle certain metals, and clean masonry. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "While the Sky Queen was being thoroughly aired, Torn questioned every member of the crew in charge of the big ship to find out how the hydrofluoric acid had become uncapped."