Noah Webster's Dictionary 1. (n.) The stay extending from the foot of the foremast to the maintop. 2. (n.) Main support; principal dependence.

Multi-Version Concordance Mainstay (1 Occurrence) Jeremiah 49:35 Thus says Yahweh of Armies: Behold, I will break the bow of Elam, the chief of their might. (See RSV NIV)