noun
(uncountable, chemistry) The univalent NO₂ functional group.
(uncountable, informal) Nitroglycerin, especially as medication.
(countable, informal) A beer that is nitrogenated to give it a more creamy head.
(uncountable, informal) Nitromethane.
(uncountable, informal) Nitrogen, especially as liquid nitrogen.
(uncountable, informal) Nitrous oxide; the system that adds nitrous oxide to a car engine; by extension, a boost mechanic to speed up cars in a video game.
adjective
(chemistry) Containing the nitro group.