Boyd’s Bible Dictionary:
A bitter plant found in Palestine, and often mentioned in Scripture in connection with gall to denote what is offensive and nauseous
(Deut. 29:18; Prov. 5:4; Jer. 9:15; 23:15; Lam. 3:15,19; Amos 5:7).
Concise Bible Dictionary:
This occurs in scripture only in a metaphorical sense. Turning to idolatry is compared to being a root that, beareth gall and wormwood (Deut. 29:18). Some turned “judgment to wormwood,” probably alluding to the unrighteous judges (Amos 5:7). Because of the wickedness of His people, God...said He would feed them with wormwood, and give them water of gall to drink (Jer. 9:15; Jer. 23:15). Jeremiah, in lamenting over the condition of Israel, compared it to being drunk with wormwood (Lam. 3:15, 19). On the sounding of the third trumpet in the Revelation, a star named Wormwood fell from heaven, and the third part of the waters were turned to wormwood, of which many men died: the moral sources of life will become destructive (Rev. 8:10-11). There are several species in Palestine: the Artemisia absinthium and A. chinensis are the wormwood of commerce.
Artemisia Absinthium