View source for Wiktionary:Word of the day/June 13

{{WOTD|nitrox|n|{{lb|en|metallurgy}} An [[industrial]] [[process#Noun|process]] for [[case hardening]] ([[impart]]ing greater [[surface#Noun|surface]] [[hardness]] to) [[metal]] [[object#Noun|objects]], involving [[nitrocarburize|nitrocarburizing]] (the [[diffusion]] of [[carbon]] and [[nitrogen]] into the metal) followed by [[oxidation]].
# {{lb|en|underwater diving}} A [[mixture]] of [[nitrogen]] and [[oxygen]], the nitrogen [[content#Noun|content]] being lower than what is normally [[present#Adjective|present]] in [[air#Noun|air]], which is used in place of air as a [[breathing gas]].|comment=British [[diving#Noun|diving]] [[engineer#Noun|engineer]] [[w:Henry Fleuss|Henry Fleuss]], who invented the first commercially practical [[scuba]] [[rebreather]], was born on this day in 1851.|June|13}}