Cold compounded gin
Cold compounded gins are flavoured with extracts, essences and/or by infusion/maceration without distillation. Compounded gins are often made by simply mixing jumpier oil and other flavour essences with neutral spirit. Such gins are generally considered inferior to distilled gins.
In a reference to the illicit gins made during Prohibition, cold compounded gins are often termed "bathtub gins". To avoid such gins, look for gins which state they are "distilled" or "London dry" on the label.