Definition from Wiktionary, the free dictionary
strongback (plural strongbacks)
- (nautical) The fore-and-aft spar extending from stem to stern on a lifeboat and serving as a raised spreader for a boat cover. (FM 55-501).
- (nautical) A strong bar placed across a hatch opening to hold hatch boards or hatch covers. (FM 55-501).
- (carpentry) a load bearing post with a "T" cross section, where the short T-tail prevents bowing of the long post
- (sculpture) a backing pole used to reinforce and stabilize vertically oriented sculptures