A spiral band of thickened albuminous substance which exists in the white of the bird's egg, and serves to maintain the yolk in its position; the treadle.
one of two spiral bands of tissue connecting the egg yolk to the enclosing membrane at either end of the shell
(plural: chalazae) One of a pair of twisted, cords of albumin found at each end of an egg, joining the shell membrane to the yolk and supporting the yolk centrally within the shell.