From en.wiktionary.org:
** English
[wikipedia]
*** Noun
[en-noun]
1. [en] An instrument that displays the pitch and roll of an aircraft in flight by comparing its attitude to a gyroscopically-maintained indication of the flat horizon line.
2. [en] A small trough containing mercury , the surface of which shows a reflection of the celestial bodies.
**** Translations
[an instrument indicating orientation]
- Portuguese: [pt]
- Russian: [ru]
[trans-bottom]
**** See also
- [en]
[en]