Acacia

(Heb. shittim) Ex 25:5, R.V. probably the Acacia seyal (the gum-arabic tree); called the “shittah” tree (Isa 41:19). Its wood is called shittim wood (Ex 26:15, Ex 26:26; Ex 25:10, Ex 25:13, Ex 25:23, Ex 25:28, etc.). This species (A. seyal) is like the hawthorn, a gnarled and thorny tree. It yields the gum-arabic of commerce. It is found in abundance in the Sinaitic peninsula.

From Easton’s Bible Dictionary (1897), by Matthew George Easton.