shiplap

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ship·lap

 (shĭp′lăp′)
n.
Wooden siding rabbeted so that the edge of one board overlaps the one next to it in a flush joint.

ship′lapped′ adj.

shiplap

(ˈʃɪpˌlæp) or

shiplapping

n
a wooden board that has been rabbeted so that the edges of each board overlap the edges of adjacent boards to create a flush and stable joint

ship•lap

(ˈʃɪpˌlæp)

n.
1. an overlapping joint, as a rabbet, between two boards joined edge to edge.
2. boarding joined with such overlapping joints.
[1850–55]