1. Of or belonging to astronauts or the science of astronautics
   - astronautical

See also: astronaut, astronautics

• Sigmodon
• Sigmodon hispidus
• sigmoid
• sigmoid colon
• sigmoid flexure
• sigmoid sinus
• sigmoid vein
• sigmoidal
• sigmoidectomy
• sigmoidoscope
• sigmoidoscopy
• Sigmund Freud
• Sigmund Romberg
• sign
• sign away
• sign in
• sign industry
• sign language
• sign manual
• sign of the cross
• sign of the zodiac
• sign off
• sign on
• sign over
• sign painter