D defs.my
Entry 2 senses Webster, 1913

Batty

/(băt"ty̆)/ · Bat·ty · IPA /ˈbæti/
01 a. Belonging to, or resembling, a bat.
  1. 1.
    Belonging to, or resembling, a bat.
  2. 2.
    Crazy; demented; loony; nuts; as, her constant gabbing is driving me batty.[Colloq.]
Syn. bats.