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Full Definition of LANGUISH. intransitive verb. 1. a: to be or become feeble, weak, or enervated b: to be or live in a state of depression or decreasing vitality. 2. a: to become dispirited. 3. : to assume an expression of grief or emotion appealing for sympathy.
Diesel exhaust fluid (DEF) is an aqueous urea solution made with 32.5% urea and 67.5% deionized water. It is standardised as AUS 32 (aqueous urea solution) in ISO 22241. DEF is used as a consumable in selective catalytic reduction (SCR) in order to lower NO x concentration in the diesel exhaust emissions from diesel engines.