Etymology

anestrus

A1N1E1S1T1R1U1S1

Today it means: In female placental mammals—excluding humans and great apes—a phase of the estrous cycle during which the sexual cycle rests. Full definition →

English estrus ← Ancient Greek ἀν- (an-) ← Proto-Hellenic *ə-
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The story

  1. Proto-Indo-European*né
  2. Proto-Indo-European*n̥-
  3. Proto-Hellenic*ə-
  4. Ancient Greekᾰ̓- (ă-)
  5. Ancient Greekἀν- (an-)
  6. Englishan-
  7. Englishestrus
  8. English todayanestrus

From an- + estrus.

Etymology from Wiktionary, CC BY-SA 4.0.