physique of h2o, h2o - the Portion of the earth's area included with water (such as a river or lake or ocean); "they invaded our territorial waters"; "they were sitting via the h2o's edge"adj attr ? Haupt-; the main rationale ? der Hauptgrund; the main plan Within this ebook ? der Haupt- or Leitgedanke in diesem Buch; what's the main detail in life