iodalChem.|ˈaɪədəl| [f. iod- + alcohol), after chloral.] A compound of iodine (CI3COH) obtained as an oily liquid; analogous to chloral, and said to possess similar properties. 1863–72Watts Dict.Chem. I. 34 (s.v.Acetyl), Hydride of Tri-iodacetyl, C2I3O.H, Iodal.