Concise Bible Dictionary:

1. Son and successor of Omri, king of Israel. He married Jezebel, daughter of Ethbaal, king of the Zidonians, and under her influence became an idolater, and led Israel into the worship of Baal. Of him it is said, there was none like him in very abominably following idols. It was chiefly in his reign that Elijah the Tishbite labored, and he testified for Jehovah against the apostasy and corruption of the king. The trial of fire from heaven is an especial instance of this, which was followed by the death of 450 of the prophets of Baal (1 Kings 18:19-4019Now therefore send, and gather to me all Israel unto mount Carmel, and the prophets of Baal four hundred and fifty, and the prophets of the groves four hundred, which eat at Jezebel's table. 20So Ahab sent unto all the children of Israel, and gathered the prophets together unto mount Carmel. 21And Elijah came unto all the people, and said, How long halt ye between two opinions? if the Lord be God, follow him: but if Baal, then follow him. And the people answered him not a word. 22Then said Elijah unto the people, I, even I only, remain a prophet of the Lord; but Baal's prophets are four hundred and fifty men. 23Let them therefore give us two bullocks; and let them choose one bullock for themselves, and cut it in pieces, and lay it on wood, and put no fire under: and I will dress the other bullock, and lay it on wood, and put no fire under: 24And call ye on the name of your gods, and I will call on the name of the Lord: and the God that answereth by fire, let him be God. And all the people answered and said, It is well spoken. 25And Elijah said unto the prophets of Baal, Choose you one bullock for yourselves, and dress it first; for ye are many; and call on the name of your gods, but put no fire under. 26And they took the bullock which was given them, and they dressed it, and called on the name of Baal from morning even until noon, saying, O Baal, hear us. But there was no voice, nor any that answered. And they leaped upon the altar which was made. 27And it came to pass at noon, that Elijah mocked them, and said, Cry aloud: for he is a god; either he is talking, or he is pursuing, or he is in a journey, or peradventure he sleepeth, and must be awaked. 28And they cried aloud, and cut themselves after their manner with knives and lancets, till the blood gushed out upon them. 29And it came to pass, when midday was past, and they prophesied until the time of the offering of the evening sacrifice, that there was neither voice, nor any to answer, nor any that regarded. 30And Elijah said unto all the people, Come near unto me. And all the people came near unto him. And he repaired the altar of the Lord that was broken down. 31And Elijah took twelve stones, according to the number of the tribes of the sons of Jacob, unto whom the word of the Lord came, saying, Israel shall be thy name: 32And with the stones he built an altar in the name of the Lord: and he made a trench about the altar, as great as would contain two measures of seed. 33And he put the wood in order, and cut the bullock in pieces, and laid him on the wood, and said, Fill four barrels with water, and pour it on the burnt sacrifice, and on the wood. 34And he said, Do it the second time. And they did it the second time. And he said, Do it the third time. And they did it the third time. 35And the water ran round about the altar; and he filled the trench also with water. 36And it came to pass at the time of the offering of the evening sacrifice, that Elijah the prophet came near, and said, Lord God of Abraham, Isaac, and of Israel, let it be known this day that thou art God in Israel, and that I am thy servant, and that I have done all these things at thy word. 37Hear me, O Lord, hear me, that this people may know that thou art the Lord God, and that thou hast turned their heart back again. 38Then the fire of the Lord fell, and consumed the burnt sacrifice, and the wood, and the stones, and the dust, and licked up the water that was in the trench. 39And when all the people saw it, they fell on their faces: and they said, The Lord, he is the God; the Lord, he is the God. 40And Elijah said unto them, Take the prophets of Baal; let not one of them escape. And they took them: and Elijah brought them down to the brook Kishon, and slew them there. (1 Kings 18:19‑40)), but there was no repentance in the king. Ahab made two attacks on Benhadad king of Syria and was helped by God so that he obtained the victory; on the second occasion instead of destroying Benhadad (whom the Lord had doomed to destruction) he made a treaty with him.
Ahab coveted the vineyard of Naboth, but on his refusal to part with the inheritance given by God to his fathers, Jezebel caused his death and bade Ahab take possession of the vineyard. Elijah met him there and declared that dogs should lick his blood where they had licked the blood of Naboth. The dogs should also eat Jezebel, and Ahab’s house should be cut off. Ahab humbled himself before God, and the full end of his house was delayed till his son’s days. After this Ahab made another attack upon Syria, and his 400 prophets foretold that he would be successful; and he, though warned of his danger by the prophet Micaiah, went into battle accompanied by Jehoshaphat king of Judah, his ally. He disguised himself, but an arrow, shot at a venture, smote him between the joints of his armor, and he was wounded to death, and the prediction of Elijah came literally to pass (1 Kings 21:2222And will make thine house like the house of Jeroboam the son of Nebat, and like the house of Baasha the son of Ahijah, for the provocation wherewith thou hast provoked me to anger, and made Israel to sin. (1 Kings 21:22)). Grace had lingered over this poor idolater, for he was an Israelite; but he died impenitent, and his whole house was soon to perish (2 Kings 9:7-107And thou shalt smite the house of Ahab thy master, that I may avenge the blood of my servants the prophets, and the blood of all the servants of the Lord, at the hand of Jezebel. 8For the whole house of Ahab shall perish: and I will cut off from Ahab him that pisseth against the wall, and him that is shut up and left in Israel: 9And I will make the house of Ahab like the house of Jeroboam the son of Nebat, and like the house of Baasha the son of Ahijah: 10And the dogs shall eat Jezebel in the portion of Jezreel, and there shall be none to bury her. And he opened the door, and fled. (2 Kings 9:7‑10)). The judgment of God fell on the apostate king who had seized the inheritance of God’s people.

Strong’s Dictionary of Hebrew Words:

once (by contraction) oEchab (Jer. 29:22) {ekh- awb'}; from {SI 10251}251{/SI} and 1; brother (i.e. friend) of (his) father; Achab, the name of a king of Israel and of a prophet at Babylon
KJV Usage:

Jackson’s Dictionary of Scripture Proper Names:

brother of father

Potts’ Bible Proper Names:

Brother, or friend, of his father; uncle:―the name of a king of Israel, 1 Kings 16:28. {Frater, sive amicus, patris}