The Collaborative International Dictionary of English v.0.48:

Adscript \Ad"script\, a. [L. adscriptus, p. p. of adscribere to
   enroll. See Ascribe.]
   Held to service as attached to the soil; -- said of feudal
   serfs.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Adscript \Ad"script\, n.
   One held to service as attached to the glebe or estate; a
   feudal serf. --Bancroft.
   [1913 Webster]

WordNet (r) 3.0 (2006):

adscript
    adj 1: written or printed immediately following another
           character and aligned with it [ant: inferior,
           subscript, superior, superscript]
    2: (used of persons) bound to a tract of land; hence their
       service is transferable from owner to owner; "an adscript
       serf" [syn: adscript, adscripted]