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The Collaborative International Dictionary
Plank-sheer

Plank-sheer \Plank"-sheer`\, n. (Shipbuilding) The course of plank laid horizontally over the timberheads of a vessel's frame.

Wiktionary
plank-sheer

n. (context shipbuilding English) The course of plank laid horizontally over the timberheads of a vessel's frame.