Where does “treeplank” come from?

treeplank (Dutch) comes from Dutch plank, from Middle Dutch planke, from Old Dutch *planka, from Old Northern French planke, from Late Latin planca, from Latin plancus, from Proto-Indo-European pleh₂- — flat.

treeplank (Dutch): running board

Definitions

running board

Ancestry of “treeplank”, step by step

treeplank traces back through two separate lines of ancestry.

via Dutch plank

Step	Language	Word	Meaning
1	Dutch	plank	shelf; plank
2	Middle Dutch	planke	—
3	Old Dutch	*planka	—
4	Old Northern French	planke	—
5	Late Latin	planca	—
6	Latin	plancus	flat-footed; Alternative form of plangus
7	Proto-Indo-European	pleh₂-	flat

via Dutch tree

Step	Language	Word	Meaning
1	Dutch	tree	step of a staircase, stair
2	Dutch	trede	Alternative form of tree
3	Middle Dutch	trede	—

Every word from Proto-Indo-European pleh₂- →Every word from Latin plancus →Every word from Late Latin planca →