/non"il, -eel, noh"nil, -neel/ , Chem.
any of several colorless or light-yellow, liquid, water-soluble isomers of the formula C 9 H 20 O, esp. having a roselike odor: used chiefly in perfumery and flavoring.
[ 1865-70; non ( ane ) (see NONANOIC) + -YL ]