Easton's Bible Dictionary
(Hebrews shittim) Exodus 25:5, R.V. probably the Acacia seyal (the gum-arabic tree); called the "shittah" tree (Isaiah 41:19). Its wood is called shittim wood (Exodus 26:15, 26; 25:10, 13, 23, 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.
Noah Webster's New International Dictionary of the English Language
1. (n.) A roll or bag, filled with dust, borne by Byzantine emperors, as a memento of mortality. It is represented on medals.
2. (n.) A genus of leguminous trees and shrubs. Nearly 300 species are Australian or Polynesian, and have terete or vertically compressed leaf stalks, instead of the bipinnate leaves of the much fewer species of America, Africa, etc. Very few are found in temperate climates.
3. (n.) The inspissated juice of several species of acacia; -- called also gum acacia, and gum arabic.