diol

[dahy-awl, -ol] /ˈdaɪ ɔl, -ɒl/
noun, Chemistry
1.
glycol (def 2).
Origin
1920-25; di-1 + -ol
British Dictionary definitions for diol

diol

/ˈdaɪɒl/
noun
1.
(chem) any of a class of alcohols that have two hydroxyl groups in each molecule Also called glycol, dihydric alcohol
Word Origin
from di-1 + (alcoh)ol
diol in Science
diol
  (dī'ôl, -ŏl)   
An alcohol containing two hydroxyl groups per molecule.