מוּסָדmûwçâd

foundation, foundation-laying (Isaiah 28:16; 2 Chronicles 8:16)

Pronunciation: moo-sawd' · Hebrew/Aramaic (Old Testament) · H4143

Same root

יָסַדyâçad · H3245to set (literally or figuratively); intensively, to found; reflexively, to sit down together, i.e. settle, consult
מוּסָדָהmûwçâdâh · H4145a foundation; figuratively, an appointment

Where it appears

Appears 2 times in the Bible.

2 Chronicles 8:16 So Solomon made sure that all the work related to building the Temple of the Lord was carried out, from the day its foundation was laid to the day of its completion.
Isaiah 28:16 Therefore, this is what the Sovereign Lord says: “Look! I am placing a foundation stone in Jerusalem, a firm and tested stone. It is a precious cornerstone that is safe to build on. Whoever believes need never be shaken.

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).