The Collaborative International Dictionary
Lying panel
Lying \Ly"ing\, p. pr. & vb. n. of Lie, to be supported horizontally.
Lying panel (Arch.), a panel in which the grain of the wood is horizontal. [R.]
Lying to (Naut.), having the sails so disposed as to counteract each other.
Wiktionary
lying panel
n. (context architecture English) A panel in which the grain of the wood is horizontal.