Heb. 'eseb, any green plant; herbage (Genesis 1:11,12,29,30; 2:5; 3:18, etc.); comprehending vegetables and all green herbage (Amos 7:1,2).
, Green; any green thing; foliage of trees (2 Kings 19:26; Psalms 37:2); a plant; herb (Deuteronomy 11:10).
, Meaning "light" In Isaiah 26:19 it means "green herbs;" in 2 Kings 4:39 probably the fruit of some plant.
, Plural, "bitter herbs," eaten by the Israelites at the Passover (Exodus 12:8; Numbers 9:11). They were bitter plants of various sorts, and referred symbolically to the oppression in Egypt.
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain, copy freely.
Easton, Matthew George. "Entry for 'Herb'". "Easton's Bible Dictionary".