1. A flow that returns toward its source
   - backflow

Type of: flow, flowing

• Sadi Carnot
• sadism
• sadist
• sadistic
• sadistically
• Sadleria
• sadly
• sadness
• sadomasochism
• sadomasochist
• sadomasochistic
• sae
• Saek
• Safaqis
• Safar
• safari
• safari park
• xylene
• xylo-
• Xylocaine
• Xylocopa
• xylography
• xylol
• Xylomelum
• Xylomelum pyriforme