The Collaborative International Dictionary of English v.0.48:

Orphan \Or"phan\, n. [L. orphanus, Gr. ?, akin to L. orbus. Cf.
   Orb a blank window.]
   A child bereaved of both father and mother; sometimes, also,
   a child who has but one parent living.
   [1913 Webster]

   Orphans' court (Law), a court in some of the States of the
      Union, having jurisdiction over the estates and persons of
      orphans or other wards. --Bouvier.
      [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

ORPHANS' COURT. The name of a court in some of the states, having
jurisdiction of the estates and persons of orphans.