Where does “trappeform” come from?

trappeform (Danish) comes from Danish trappe, from Middle Low German trappe, from Old Saxon *trappa, from Proto-West Germanic *trappā — staircase, stairs.

trappeform (Danish): row echelon form

Definitions

row echelon form

Ancestry of “trappeform”, step by step

trappeform traces back through two separate lines of ancestry.

via Danish trappe

Step	Language	Word	Meaning
1	Danish	trappe	stairs, stairway; bustard
2	Middle Low German	trappe	stair, step
3	Old Saxon	*trappa	—
4	Proto-West Germanic	*trappā	staircase, stairs

via Danish form

Step	Language	Word	Meaning
1	Danish	form	form; shape; mould
2	Latin	fōrma	form; figure, shape, appearance
3	Etruscan	morma	—
4	Ancient Greek	μορφή	shape, form; appearance; outline

Every word from Proto-West Germanic *trappā →