biofeedback (English)
├── bio- (English)
│ └── βίος (Ancient Greek (to 1453))
└── feedback (English)
├── back (English)
│ └── bak (Middle English (1100-1500))
│ └── bæc (Old English (ca. 450-1100))
└── feed (English)
└── feden (Middle English (1100-1500))
└── fedan (Old English (ca. 450-1100))
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