Hinnom

Boyd’s Bible Dictionary:

A valley west and southwest of Jerusalem
And the border went up by the valley of the son of Hinnom unto the south side of the Jebusite; the same is Jerusalem: and the border went up to the top of the mountain that lieth before the valley of Hinnom westward, which is at the end of the valley of the giants northward: (Joshua 15:8)
And the border came down to the end of the mountain that lieth before the valley of the son of Hinnom, and which is in the valley of the giants on the north, and descended to the valley of Hinnom, to the side of Jebusi on the south, and descended to En-rogel, (Joshua 18:16)
And he defiled Topheth, which is in the valley of the children of Hinnom, that no man might make his son or his daughter to pass through the fire to Molech. (2 Kings 23:10)
Zanoah, Adullam, and in their villages, at Lachish, and the fields thereof, at Azekah, and in the villages thereof. And they dwelt from Beer-sheba unto the valley of Hinnom. (Nehemiah 11:30)
Children offered in sacrifice in
Moreover he burnt incense in the valley of the son of Hinnom, and burnt his children in the fire, after the abominations of the heathen whom the Lord had cast out before the children of Israel. (2 Chronicles 28:3)
And he caused his children to pass through the fire in the valley of the son of Hinnom: also he observed times, and used enchantments, and used witchcraft, and dealt with a familiar spirit, and with wizards: he wrought much evil in the sight of the Lord, to provoke him to anger. (2 Chronicles 33:6)
And they have built the high places of Tophet, which is in the valley of the son of Hinnom, to burn their sons and their daughters in the fire; which I commanded them not, neither came it into my heart. Therefore, behold, the days come, saith the Lord, that it shall no more be called Tophet, nor the valley of the son of Hinnom, but the valley of slaughter: for they shall bury in Tophet, till there be no place. (Jeremiah 7:31-32)
And go forth unto the valley of the son of Hinnom, which is by the entry of the east gate, and proclaim there the words that I shall tell thee, (Jeremiah 19:2)
Because they have forsaken me, and have estranged this place, and have burned incense in it unto other gods, whom neither they nor their fathers have known, nor the kings of Judah, and have filled this place with the blood of innocents; (Jeremiah 19:4)
Therefore, behold, the days come, saith the Lord, that this place shall no more be called Tophet, nor The valley of the son of Hinnom, but The valley of slaughter. (Jeremiah 19:6)
And they built the high places of Baal, which are in the valley of the son of Hinnom, to cause their sons and their daughters to pass through the fire unto Molech; which I commanded them not, neither came it into my mind, that they should do this abomination, to cause Judah to sin. (Jeremiah 32:35)
Possibly identical with the valley of the vision
The burden of the valley of vision. What aileth thee now, that thou art wholly gone up to the housetops? (Isaiah 22:1)
For it is a day of trouble, and of treading down, and of perplexity by the Lord God of hosts in the valley of vision, breaking down the walls, and of crying to the mountains. (Isaiah 22:5)
See TOPHET

Concise Bible Dictionary:

This is often called “the valley of the son of Hinnom,” but who Hinnom and his son were is unknown (Josh. 15:8; Josh. 18:16; Neh. 11:30). The valley running from east to west, on the south of Jerusalem, now bears the above name. In some part of this, supposed to be the east end, children were passed through the fire to false gods (Jer. 7:31-32; Jer. 32:35). To prevent this Josiah defiled TOPHETH in this valley (2 Kings 23:10; 2 Chron. 28:3; 2 Chron. 33:6). The prophet Isaiah gives the key to its being associated in the New Testament (under the name of GEHENNA) with eternal punishment: “Tophet is ordained of old; yea, for the king it is prepared; he hath made it deep and large: the pile thereof is fire and much wood; the breath of the Lord, like a stream of brimstone, doth kindle it” (Isa. 30:33). See HELL. In God’s judgments the valley shall become the “valley of slaughter” (Jer. 19:2-14).

Strong’s Dictionary of Hebrew Words:

Transliteration:
Hinnom
Phonic:
hin-nome’
Meaning:
probably of foreign origin; Hinnom, apparently a Jebusite
KJV Usage:
Hinnom

Jackson’s Dictionary of Scripture Proper Names:

to make self drowsy: behold them

Potts’ Bible Proper Names:

Sorrow; lamentation; full of goodness:―a narrow valley S. and W. of Jerusalem, Josh. 15:8. {Lamentatio}