'Sizer' definitions:

Definition of 'Sizer'

From: GCIDE

Sizer \Siz"er\, n.
1. See Sizar. [1913 Webster]
2. (Mech.) (a) An instrument or contrivance to size articles, or to determine their size by a standard, or to separate and distribute them according to size. (b) An instrument or tool for bringing anything to an exact size. [1913 Webster]