gy·ro pilot 
(jīrō)
(jīrō)n.
An automatic pilot incorporating a gyroscope that initiates corrections to control surfaces on aircraft and thus maintains a preset course and altitude.
- S(idney) J(oseph)
- Sidon
- (Sidonie Gabrielle Claudine)
- Sidra
- SIDS
- siege
- Siegen
- Siege Perilous
- Siegfried
- Siegfried Lorraine
- siemens
- Siemens
- Siena
- Sienese
- Sienkiewicz
- sienna
- sierozem
- sierra
- Sierra Leone
- Sierra Leonean
- Sierra Madre del Sur
- Sierra Madre Occidental
- Sierra Madre Oriental
- sierran
- Sierra Nevada