Oust"er (?), n. [Prob. fr. the OF. infin. oster, used substantively. See Oust.]
A putting out of possession; dispossession; ejection; disseizin.
Ouster of the freehold is effected by abatement, intrusion, disseizin, discontinuance, or deforcement.
Ouster le main. [Ouster + F. la main the hand, L. manus.] Law A delivery of lands out of the hands of a guardian, or out of the king's hands, or a judgement given for that purpose.
© Webster 1913.