Myrrh  is the aromatic resin of a number of small, thorny tree species of the genus Commiphora, which is an essential oil termed an oleoresin. Myrrh resin is a natural gum.  When a tree wound penetrates through the bark and into the sapwood, the tree bleeds a resin. Myrrh gum, like frankincense, is such a resin.  The word "myrrh" derives from the Aramaic ܡܪܝܪܐ (murr), meaning "was bitter". Its name entered the English language from the Hebrew Bible, where it is called mor, מור, and later as a Semitic loanword was used in the Greek myth of Myrrha, and later in the Septuagint; in the Greek language, the related word μύρον became a general term for perfume.  So valuable has it been at times in ancient history that it has been equal in weight value to gold. During times of scarcity, its value rose even higher than that. It has been used throughout history as a perfume, incense and medicine