Etymology

heptahydrate

H4E1P3T1A1H4Y4D2R1A1T1E1

Today it means: A hydrate whose solid contains seven molecules of water of crystallization per molecule, or per unit cell Full definition →

English hydrate ← French hydrate ← Ancient Greek ἑπτᾰ́ (heptắ)
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The story

  1. Proto-Afroasiatic*sṗɣ?
  2. Proto-Semitic*šabʕ-bor.?
  3. Proto-Indo-European*septḿ̥
  4. Proto-Hellenic*heptə́
  5. Ancient Greekἑπτᾰ́ (heptắ)
  6. Englishhepta-
  7. Frenchhydrate
  8. Englishhydrate
  9. English todayheptahydrate

From hepta- + hydrate.

Etymology from Wiktionary, CC BY-SA 4.0.