Standard Lemma guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
No pronunciation record was provided for this word.
adj
Having two rotors; having two main rotors.
Definition source: English Wiktionary via Wiktextract
Usage: not-comparable
Qualifier: helicopters; or drones; helicopters; or drones
Topics: engineering, natural-sciences, physical-sciences, technology
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
A pump or rotorcraft with two rotors or two main rotors.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
Etymology tree Proto-Indo-European *dwóh1 Proto-Indo-European *dwi- Proto-Italic *dwi- Latin bi-bor. English bi- English rotor English birotor From bi- + rotor. Late 19th to early 20th century, originally with reference to pumps.
Across languages
1 source translations are retained for this English entry.
