noun. A gum resin obtained from the root of Opopanax chironium, formerly used in medicine.

noun. A perfume made from the gum resin of various trees.

noun. The opopanax tree, Acacia farnesiana, an acacia of America.

"Three loves – ancient loves – vanish in tears … I did this in four days in a room of blue satin, in an overheated apartment, full of different smells, where the opopanax and cyclamen gave me a slight fever conducive towards production or even towards reproduction."