Cinnamon

Boyd’s Bible Dictionary:

(dried). Inner bark of the cinnamon-tree (Ex. 30:23: Rev. 18:13). A perfume (Prov. 7:17).

Concise Bible Dictionary:

Cinnamon
The bark of the Cinnamon tree, a well-known aromatic product, which formed one of the ingredients of the holy anointing oil. It was a valuable article of merchandise (Ex. 30:23; Prov. 7:17; Song of Sol. 4:14; Rev. 18:13).