D defs.my
Entry 1 sense Webster, 1913

-logy

/-ləjē/ · -lo·gy · IPA /-lə.d͡ʒi/
01 suff. A combining form denoting a discourse, treatise, doctrine, theory, science; as, theology, geology, biology, mineralogy.
  1. 1.
    A combining form denoting a discourse, treatise, doctrine, theory, science; as, theology, geology, biology, mineralogy.