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ESPERANTO · A WORD WITH POSSIBILITIES

aerkastelo.

castle in the air; pipe dream

10 characters4 syllables approx.Esperanto language

Meaning & usage

noun/aerkasˈtelo/
  1. castle in the air; pipe dream

    idiomatic
Where this word comes from

Etymology tree Proto-Indo-European *h₂ews- Proto-Indo-European *-r Proto-Indo-European *h₂ewsér Proto-Hellenic *auhḗr Ancient Greek ᾱ̓ήρ (āḗr)bor. Latin āērder. Esperanto aero Proto-Indo-European *ḱes- Proto-Indo-European *-tḗr Proto-Indo-European *-trom Proto-Indo-European *ḱstrom Proto-Italic *kastrom Latin castrum Proto-Indo-European *-lós Proto-Indo-European *-elós Proto-Italic *-elos Latin -lum Latin castellumder. Esperanto kastelo Esperanto aerkastelo Calque from a Germanic language, equivalent to aero + kastelo; compare Danish luftkastel, Dutch luchtkasteel, and German Luftschloss.

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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.