What is "shadder"

Usage examples of "shadder".

I was just saying this to myself when something swift and still as a shadder brushed past the place where I was hid.

With the exception of Lord Shadder, Alessan apparently did not share any of her preferences among the leaders of Pern.

I reckon, if I may say so, shadders is my specialty, me bein' somethin' o' a night owl.

The moon come a-swelling up out of the ground, now, powerful big and round and bright, behind a comb of trees, like a face looking through prison bars, and the black shadders and white places begun to creep around, and it was miserable quiet and still and night-breezy and graveyardy and scary.