† excoˈlationObs.rare—1. [ad. L. excōlātiōn-em, n. of action f.excōlāre to strain out, f.ex- out + cōlāre to filter.] The action of filtering or straining out. 1578Banister Hist. Man v. 83 A certaine worke made in the reynes to the excretion or excolation of Urine.