underpressure en · NOUN
Pronunciation
- (US) audio
Etymology
Etymology tree Proto-Indo-European *h₁én Proto-Indo-European *-tér Proto-Indo-European *h₁entér Proto-Indo-European *h₂én Proto-Indo-European *dʰeh₁-? Proto-Indo-European *-dʰi ? Proto-Indo-European *(H)n̥dʰí Proto-Indo-European *-ér Proto-Indo-European *(H)n̥dʰér Proto-Germanic *under Proto-West Germanic *undar Old English under- Middle English under- English under- English pressure English underpressure From under- + pressure.
Meanings
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insufficient pressure; a marked drop in pressure
The expanding-hot-channel mechanism predicts an initial positive pressure change (an overpressure) while the electrostatic-pressure-relief mechanism predicts an initial negative pressure change (an underpressure).
2007, Vladimir A. Rakov, Martin A. Uman, Lightning: Physics and Effects, page 378:
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| underpressures | Number=Plur | lexicographic |
Antonyms
Translations (4)
cs podtlak (insufficient pressure) · sv undertryck (insufficient pressure) · de Unterdruck (insufficient pressure) · fi alipaine (insufficient pressure)