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respective
respectively
respell
respirable
respiration
respirator
respiratory
respiratory distress syndrome
respiratory pigment
respiratory quotient
respiratory system
respire
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respiratory pigment
res·pi·ra·to·ry pig·ment (plural res·pi·ra·to·ry pig·ments)


noun 
Definition:
 
protein important in respiration: a protein that can bind with oxygen, e.g. hemoglobin
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