\Cin*nam"ic\, a. [From {Cinnamon}.] (Chem.)
Pertaining to, or obtained from, cinnamon.
{Cinnamic acid} (Chem.), a white, crystalline, odorless
   substance. {C6H5.C2H2C2H2.CO2H}, formerly obtained from
   storax and oil of cinnamon, now made from certain benzene
   derivatives in large quantities, and used for the
   artificial production of indigo.