Barbiturates

Drugs that act as central nervous system (CNS) depressants. They produce a wide spectrum of effects from mild sedation to anaesthesia. Some barbiturates are used to treat convulsions.
Found on http://thewellnessshop.co.uk/healthandwellbeing/glossary.html

Barbiturates

a group of sedatives that reduce activity in the brain; are habit-forming and are possibly fatal when taken with alcohol
Found on http://www.medichecks.com/glossary.cfm?ltr=B

barbiturates

A class of chemicals derived from barbituric acid or thiobarbituric acid. Many of these are medically important as sedatives and hypnotics (sedatives, barbiturate), as anaesthetics, or as anticonvulsants. ... (12 Dec 1998) ...
Found on http://www.mondofacto.com/facts/dictionary?barbiturates
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