The Collaborative International Dictionary of English v.0.48:

Sizar \Si"zar\, n.
   One of a body of students in the universities of Cambridge
   (Eng.) and Dublin, who, having passed a certain examination,
   are exempted from paying college fees and charges. A sizar
   corresponded to a servitor at Oxford.
   [1913 Webster]

         The sizar paid nothing for food and tuition, and very
         little for lodging.                      --Macaulay.
   [1913 Webster]

   Note: They formerly waited on the table at meals; but this is
         done away with. They were probably so called from being
         thus employed in distributing the size, or provisions.
         See 4th Size, 2.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Batteler \Bat"tel*er\, Battler \Bat"tler\, n. [See 2d Battel,
   n.]
   A student at Oxford who is supplied with provisions from the
   buttery; formerly, one who paid for nothing but what he
   called for, answering nearly to a sizar at Cambridge.
   --Wright.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Famulist \Fam"u*list\, n. [L. famulus servant.]
   A collegian of inferior rank or position, corresponding to
   the sizar at Cambridge. [Oxford Univ., Eng.]
   [1913 Webster]