This will normally mean that the hydroxyl group is joined to the same carbon atom as a branch. 2-methylpropan-2-ol is a tertiary alcohol. Multiple hydroxyl groups.

Proprietary system seeks out and destroys airborne and surface-based mold, bacteria, viruses and other pathogens in real-time Food contamination costs the US Economy over $18 billions of dollars ...

The hydroxyl number denotes the quantity of potassium hydroxide (in milligrams) needed in order to neutralize acetic acid required for acetylation of 1 gram of an unsaturated polyester resin (UPR) ...