The backstairs (stairs at the rear of a building).
clandestine, secret or furtive
Plumage.
The fitting of feathers to arrows.
Visible offshoots of the trails of ink written on overly absorbent paper.
A feathered texture.
An arrangement of small arcs or foils separated by projecting cusps, frequently forming the feather-like ornament on the inner mouldings of arches.