The Collaborative International Dictionary of English v.0.48:

Moder \Mo"der\, n. [OE. See Mother female parent.]
   1. A mother. [Obs.] --Chaucer.
      [1913 Webster]

   2. The principal piece of an astrolabe, into which the others
      are fixed. [Obs.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Moder \Mod"er\, v. t.
   To moderate. [Obs.]
   [1913 Webster]