Entry 3 senses · 2 variants Webster, 1913 Moder /mŏd′ər/ · Mo·der · IPA /ˈmɔd.əɹ/ n. v. t. 01 n. A mother. 1. A mother.[Obs.] 2. The principal piece of an astrolabe, into which the others are fixed.[Obs.] 02 v. t. To moderate. 1. To moderate.[Obs.]