polyrhythmically

Etymology tree
Proto-Indo-European *pleh₁-
Proto-Indo-European *polh₁ús
Ancient Greek πολῠ́ς (polŭ́s)lbor.
English poly-
Proto-Indo-European *ser-?
Proto-Indo-European *srew-
Proto-Indo-European *sru-dʰ-mo-s
Proto-Hellenic *hrutʰmós
Ancient Greek ῥῠθμός (rhŭthmós)bor.
Latin rhythmusder.
English rhythm
English polyrhythm
Proto-Indo-European *-ikos
Proto-Italic *-ikos
Latin -icuslbor.
Old French -iquebor.
Middle English -ik
English -ic
English polyrhythmic
Proto-Indo-European *h₂el-der.?
Proto-Italic *-ālis
Latin -ālisbor.
Old French -albor.
▲
Latin -ālis
Old French -elbor.
▲
Latin -ālisbor.
Middle English -al
Proto-Indo-European *leyg-der.
Proto-Germanic *līkąder.
Proto-Germanic *-līkaz
Proto-Germanic *-ê
Proto-Germanic *-līkê
Proto-West Germanic *-līkē
Old English -līċe
Middle English -ly
Middle English -ally
English -ally
▲
English poly-
▲
Ancient Greek ῥῠθμός (rhŭthmós)
Proto-Indo-European *-kos
Ancient Greek -κός (-kós)
Ancient Greek -ῐκός (-ĭkós)
Ancient Greek ῥυθμικός (rhuthmikós)
English rhythmic
▲
Middle English -al
English -al
English rhythmical
English polyrhythmical
▲
Middle English -ly
English -ly
English polyrhythmically
From polyrhythmic + -ally, or from polyrhythmical + -ly.