Basic Guidelines For English Spellings
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1Respiratory.
Now chiefly in English-language texts from non-English-speaking countries.
2Biology
Of or relating to the processes of oxygen transport, gas exchange, and aerobic respiration.
Now chiefly in English-language texts from non-English-speaking countries.
Late Middle English; earliest use found in Guy de Chauliac's Grande Chirurgie. From post-classical Latin respirativus respiratory from classical Latin respīrāt-, past participial stem of respīrāre + -īvus.