[f. as prec. + -ER1.] One who or that which estranges, parts asunder, or causes estrangement.
1623. Drumm. of Hawth., Cypress Grove, Wks. (1711), 117. Death is the violent Estranger of Acquaintance.
1850. Mrs. Browning, Poems, I. 130. What estranger, What ill most strong in evil, can be thrust Between the faithful Father and the Son.