Source : Webster's Revised Unabridged Dictionary (1913)

Fructuary \Fruc"tu*a*ry\ (fr[u^]k"t[-u]*[asl]*r[y^]), n.; pl.
   {Fructuaries} (-r[i^]z). [L. fructuarius.]
   One who enjoys the profits, income, or increase of anything.

         Kings are not proprietors nor fructuaries. --Prynne.