Etymology

hydrological

H4Y4D2R1O1L1O1G2I1C3A1L1

Today it means: Of or pertaining to hydrology. Full definition →

Proto-Indo-European *h₂élisder.? ← English hydrology
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The story

  1. Englishhydrology
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. English todayhydrological

From hydrology + -ical.

Etymology from Wiktionary, CC BY-SA 4.0.