Simple past tense and past participle of respire.(verb)
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Use "respired" in a sentence
"They're weighted down on the edges and they're so huge the respired gas doesn't escape as fast as it builds up, so there's a mini atmosphere underneath."
"Although winter CO2 losses have long been recognized [48], more recent research indicates that these losses are greater than was previously thought and may be the product of significant respiratory activity during the winter [49] (section 7.3.2.3), when recently fixed C is respired [50]."
"The CH4/CO2 ratio or the percentage contribution of CH4 to total respired C varies from 20% in extreme cases in wet tundra ecosystems."