Source : Webster's Revised Unabridged Dictionary (1913)

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

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

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