אֲדֹנִי־צֶדֶקʼĂdônîy-Tsedeq

proper name, masculine: Canaanite king of Jerusalem (Joshua 10:1; Joshua 10:3)

Pronunciation: ad-o''-nee-tseh'-dek · Hebrew/Aramaic (Old Testament) · H139

Same root

אָדוֹןʼâdôwn · H113sovereign, i.e. controller (human or divine)
צֶדֶקtsedeq · H6664the right (natural, moral or legal); also (abstractly) equity or (figuratively) prosperity

Where it appears

Appears 4 times in the Bible.

Joshua 10:1 Adoni-zedek, king of Jerusalem, heard that Joshua had captured and completely destroyed Ai and killed its king, just as he had destroyed the town of Jericho and killed its king. He also learned that the Gibeonites had made peace with Israel and were now their allies.
Joshua 10:3 So King Adoni-zedek of Jerusalem sent messengers to several other kings: Hoham of Hebron, Piram of Jarmuth, Japhia of Lachish, and Debir of Eglon.

See every passage

Joshua 10:1, 10:3

Source: Brown, Driver and Briggs, Hebrew and English Lexicon of the Old Testament (1906), public domain; markup by unfoldingWord, CC BY (github.com/unfoldingWord/Brown-Driver-Briggs-Enhanced).