Know how to use "fewer" and "less"? Find out.
1934, from benzo-, word-forming element used in chemistry to indicate presence of a benzene ring fused with another ring, + di + azo- + epine, a suffix denoting a seven-membered ring, from (h)ep(ta) (see seven).
benzodiazepine ben·zo·di·az·e·pine (běn'zō-dī-āz'ə-pēn', -pĭn)
Any of a group of psychotropic agents used as antianxiety agents, muscle relaxants, sedatives, and hypnotics.