What does adumbration mean?
The definition of adumbration
Ad`um*bra”tion, n.
Etym: [L. adumbratio.]

1 The act of adumbrating, or shadowing forth.
2 A faint sketch; an outline; an imperfect portrayal or representation of a thing. Elegant adumbrations of sacred truth. Bp. Horsley.
3 (Her.)
The shadow or outlines of a figure.