D defs.my
Entry 2 senses Webster, 1913

Geology

/jē-ŏʹlə-jē/ · Ge·ol·o·gy · IPA /d͡ʒiˈɑ.lə.dʒi/
01 n. The science which treats: (a) Of the structure and mineral constitution of the globe; structural geology. (b) Of its history as regards roc…
pl. Geologies ((#))
  1. 1.
    The science which treats: (a) Of the structure and mineral constitution of the globe; structural geology. (b) Of its history as regards rocks, minerals, rivers, valleys, mountains, climates, life, etc.; historical geology. (c) Of the causes and methods by which its structure, features, changes, and conditions have been produced; dynamical geology. See Chart of The Geological Series. See: The Geological Series
  2. 2.
    A treatise on the science.