Mouldy

Of the Gibeonites it is said that "all the bread of their
provision was dry and mouldy" (Josh. 9:5, 12). The Hebrew word
here rendered "mouldy" (nikuddim) is rendered "cracknels" in 1
Kings 14:3, and denotes a kind of crisp cake. The meaning is
that the bread of the Gibeonites had become dry and hard, hard
as biscuits, and thus was an evidence of the length of the
journey they had travelled.