To remove oxygen from something, such as blood or water.
From de- (to remove) + oxygenate (to add oxygen). The verb oxygenate comes from oxygen (the element discovered in the 1770s) plus -ate (verb suffix).
When blood circulates through your body and delivers oxygen to your cells, it becomes deoxygenated—this dark red blood then travels back to your lungs to pick up fresh oxygen and turn bright red again.
Complete word intelligence in one call. Free tier — 50 lookups/day.