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ENGLISH · A WORD WITH POSSIBILITIES

foe.

Hostile.

3 characters1 syllables approx.English language

Meaning & usage

adj/fəʊ/Received-Pronunciation/foʊ/General-American
  1. Hostile.

    obsolete
Where this word comes from

From Middle English fo (“foe; hostile”), from earlier yfoh, yvo, ifa (“foe”), from Old English ġefāh (“enemy”), from fāh (“hostile”), from Proto-West Germanic *faih, from Proto-Germanic *faihaz (compare Old Frisian fāch (“punishable”), Middle High German gevēch (“feuder”)), from Proto-Indo-European *peyk/ḱ- (“to hate, be hostile”) (compare Middle Irish óech (“enemy, fiend”), Lithuanian pi̇̀ktas (“evil”)).

noun/fəʊ/Received-Pronunciation/foʊ/General-American
  1. An enemy.

Where this word comes from

From Middle English fo (“foe; hostile”), from earlier yfoh, yvo, ifa (“foe”), from Old English ġefāh (“enemy”), from fāh (“hostile”), from Proto-West Germanic *faih, from Proto-Germanic *faihaz (compare Old Frisian fāch (“punishable”), Middle High German gevēch (“feuder”)), from Proto-Indo-European *peyk/ḱ- (“to hate, be hostile”) (compare Middle Irish óech (“enemy, fiend”), Lithuanian pi̇̀ktas (“evil”)).

noun/fəʊ/Received-Pronunciation/foʊ/General-American
  1. A unit of energy equal to 10⁴⁴ joules.

Where this word comes from

Acronym of [ten to the power of] fifty-one ergs, due to equalling 10⁵¹ ergs; coined by Gerald Brown of Stony Brook University in his work with Hans Bethe.

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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.