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ENGLISH · A WORD WITH POSSIBILITIES

oestrus.

A biting fly of the genus Oestrus; a botfly.

7 characters2 syllables approx.English language

Meaning & usage

noun/ˈiːstɹəs//ˈɛstɹəs/
  1. A biting fly of the genus Oestrus; a botfly.

    countable
  2. A bite or sting.

    countable
  3. A passion or frenzy.

    archaic · countable
  4. A female animal's readiness to mate.

    countable · uncountable
Where this word comes from

Etymology tree Proto-Indo-European *h₁eysh₂-der. Ancient Greek οἶστρος (oîstros)der. Latin oestrusbor. English oestrus Borrowed from Latin oestrus (“gadfly, sting, frenzy”), from Ancient Greek οἶστρος (oîstros), from Proto-Indo-European *h₁eys-, used to form words denoting passion; see also Latin īra (“anger”), Lithuanian aistra (“violent passion”), Avestan 𐬀𐬈𐬯𐬨𐬀 (aesma, “anger”).

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.