And the name of the star is called {8} Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter.

(8) This is spoken by metaphor of a commonly known bitter herb: unless perhaps a man following those that note the derivation of words would rather explain it as an adjective for that which cannot be drunk because of its bitterness, causing the liquid it is made into to be more bitter than any man can drink.

People's New Testament

8:11 The name of the star is called Wormwood. That is, it is bitterness, because it shall fill the world with bitter sorrow. A star is a symbol of a great leader. Such a star as this, a blazing meteor, is a symbol of a leader who suddenly appears, rapidly does an awfully baleful work, and then disappears.

And the third part of the waters became wormwood. In some way the rivers will be the scenes of his malign influence. They shall become bitterness and shall be scenes of death.

Wesley's Notes

8:11 And the name of the star is called Wormwood - The unparalleled bitterness both of Arius himself and of his followers show the exact propriety of his title. And the third part of the waters became wormwood - A very considerable part of Afric was infected with the same bitter doctrine and Spirit. And many men (though not a third part of them) died - By the cruelty of the Arians.

Jamieson-Fausset-Brown Bible Commentary

11. The symbolizers interpret the star fallen from heaven as a chief minister (Arius, according to Bullinger, Bengel, and others; or some future false teacher, if, as is more likely, the event be still future) falling from his high place in the Church, and instead of shining with heavenly light as a star, becoming a torch lit with earthly fire and smouldering with smoke. And "wormwood," though medicinal in some cases, if used as ordinary water would not only be disagreeable to the taste, but also fatal to life: so "heretical wormwood changes the sweet Siloas of Scripture into deadly Marahs" [Wordsworth]. Contrast the converse change of bitter Marah water into sweet, Ex 15:23. Alford gives as an illustration in a physical point of view, the conversion of water into firewater or ardent spirits, which may yet go on to destroy even as many as a third of the ungodly in the latter days.

Matthew Henry's Concise Commentary

8:7-13 The first angel sounded the first trumpet, and there followed hail and fire mingled with blood. A storm of heresies, a mixture of dreadful errors falling on the church, or a tempest of destruction. The second angel sounded, and a great mountain, burning with fire, was cast into the sea; and the third part of the sea became blood. By this mountain some understand leaders of the persecutions; others, Rome sacked by the Goths and Vandals, with great slaughter and cruelty. The third angel sounded, and there fell a star from heaven. Some take this to be an eminent governor; others take it to be some person in power who corrupted the churches of Christ. The doctrines of the gospel, the springs of spiritual life, comfort, and vigour, to the souls of men, are corrupted and made bitter by the mixture of dangerous errors, so that the souls of men find ruin where they sought refreshment. The fourth angel sounded, and darkness fell upon the great lights of heaven, that give light to the world, the sun, and the moon, and the stars. The guides and governors are placed higher than the people, and are to dispense light, and kind influences to them. Where the gospel comes to a people, and has not proper effects on their hearts and lives, it is followed with dreadful judgments. God gives alarm by the written word, by ministers, by men's own consciences, and by the signs of the times; so that if people are surprised, it is their own fault. The anger of God makes all comforts bitter, and even life itself burdensome. But God, in this world, sets bounds to the most terrible judgments. Corruption of doctrine and worship in the church are great judgments, and also are the usual causes and tokens of other judgments coming on a people. Before the other three trumpets were sounded, there was solemn warning how terrible the calamities would be that should follow. If lesser judgments do not take effect the church and the world must expect greater; and when God comes to punish the world, the inhabitants shall tremble before him. Let sinners take warning to flee from the wrath to come; let believers learn to value and to be thankful for their privileges; and let them patiently continue in well doing.