phosphinous

Etymology tree
Proto-Indo-European *bʰeh₂-
Proto-Indo-European *bʰéh₂os
Proto-Hellenic *pʰáwos
Ancient Greek φᾰ́ος (phắos)
Ancient Greek φῶς (phôs)
Ancient Greek -φόρος (-phóros)
Ancient Greek φωσφόρος (phōsphóros)bor.
Latin phōsphorusbor.
English phosphorusclip.
English phosph-
Proto-Indo-European *-nós
Proto-Indo-European *-iHnos
Proto-Italic *-īnos
Latin -īnusder.
Old French -inbor.
Middle English -in
English -ine
English phosphine
Latin -ōsus
Old French -usbor.
Middle English -ous
English -ous
English phosphinous
From phosphine + -ous.