fiar noun2 •One in whom the property of an estate is vested, subject to the estate of a liferenter. •(historical) The price of grain in the counties of Scotland, as legally fixed on an annual basis.It seems to be a practice as improper as it is unnecessary, to strike the fiars in three different qualities of the same species of grain; and it should, in our humble opinion, be discontinued. — 1817 formsfiars