Of a solution: one tenth as concentrated as a normal solution; containing one tenth of a gram-equivalent of solute or solvated ion per litre of solution.
Origin
Mid 19th century. From deci- + normal.
Definition of decinormal in US English:
decinormal
adjectiveˌdɛsɪˈnɔːml
Chemistry
Of a solution: one tenth as concentrated as a normal solution; containing one tenth of a gram-equivalent of solute or solvated ion per litre of solution.