From the same as 'adown (in the sense of strength); a basis (of a building, a column, etc.) -- foundation, socket.
see HEBREW 'adown
1 pedestals of fine gold, on which pillars of marble were set Song of Solomon 5:15.
2 pedestals of the earth on which its pillars were placed Job 38:6 ("" corner-stone).
3 (metal) pedestals, bases, or sockets in which tenons of planks & pillars of tabernacle were set up; two for each plank & one for each pillar Exodus 26:19 (3 t. in verse) + 52 t. in Exodus 26, 27, 35-40 Numbers 3, 4 (all P); compare ᵐ5 Sm Co for אָרְכּוֺ Ezekiel 41:22, of altar.