Tha ‧ lid ‧ o ‧ mide /θəˈlɪdəmaɪd/ BrE AmE noun [uncountable]
[ Date: 1900-2000 ; Origin: phthalic acid type of acid (19-21 centuries) (from naphtha ) + imide type of chemical compound (19-21 centuries) (from French , from amide ) ]
trademark a drug given to people to make them calm, until it was discovered that it harmed the development of the arms and legs of unborn babies