a. [ From Cinnamon. ] (Chem.) Pertaining to, or obtained from, cinnamon. [ 1913 Webster ]
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. [ 1913 Webster ]