S/F ratio

From SpO2/FiO2 ratio. Etymology tree Proto-Indo-European *per-der. Ancient Greek περί (perí) Ancient Greek περῐ- (perĭ-) Proto-Indo-European *bʰer- Proto-Indo-European *bʰéreti Proto-Hellenic *pʰérō Ancient Greek φέρω (phérō) Ancient Greek περιφέρω (periphérō) Proto-Indo-European *-os Proto-Indo-European *-ēs Ancient Greek -ης (-ēs) Ancient Greek περιφερής (peripherḗs) Proto-Indo-European *-h₂ Proto-Indo-European *-ih₂der. Ancient Greek -ια (-ia) Ancient Greek περιφέρεια (periphéreia)bor. Latin peripheriabor. Middle French peripheriebor. English periphery Proto-Indo-European *h₂el-der.? Proto-Italic *-ālis Latin -ālisbor. Old French -albor. ▲ Latin -ālis Old French -elbor. ▲ Latin -ālisbor. Middle English -al English -al English peripheral Proto-Indo-European *h₂eḱ-der.? Ancient Greek ὀξύς (oxús) Proto-Indo-European *ǵenh₁- Proto-Indo-European *-os Proto-Indo-European *ǵénh₁os Proto-Hellenic *génos Ancient Greek γένος (génos) French oxygènebor. English oxygen Late Latin saturatiobor. English saturation English peripheral oxygen saturation English SpO2 Middle English fraccioun English fraction Proto-Indo-European *-o Proto-Indo-European *h₂epó Proto-Germanic *ab Proto-West Germanic *ab Old English æf Old English of Middle English of English of English inspired ▲ English oxygen English FiO2 English ratio English SpO2/FiO2 ratio English S/F ratio

来源：wiktionary