A plant with a bitter taste, and therefore a metaphor for bitterness (Prov. 5: 4) and sorrow (Jer. 23: 15). A star which fell from heaven and poisoned the waters is called Wormwood (Rev. 8: 11).
Citation for wormwood
Citation styles are based on the Chicago Manual of Style, 15th Ed., and the MLA Style Manual, 2nd Ed..
MLA
"wormwood." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. May 22, 2013. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e2060>.
Chicago
"wormwood." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e2060 (accessed May 22, 2013).