The Collaborative International Dictionary
Cinnamic \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.
Wiktionary
a. 1 Of or pertaining to cinnamon 2 (context organic chemistry English) Of or pertaining to cinnamic acid or its derivatives
Wikipedia
Usage examples of "cinnamic".
Such bark chemically contains cinnamic acid, tannin, a resin, and sugar, so that its continued use will induce constipation.
There are also found in it cinnamyl acetate, cinnamic acid, phenylpropyl acetate and orthocumaric aldehyde, tannic acid and starch.
Its value depends on the percentage of cinnamic aldehyde which it contains.