English

intrafilar

intra- + filar

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁énteros ‘inside, within’

Latin *interus

Latin intrā ‘within’

Proto-Indo-European *gʷʰiH-(s-)lo- ‘sinew’

Proto-Italic *fī(s)lom

Latin filum ‘a thread’

English filar

Today it means

adj Within a filament.

Language periods are conventional ranges, not dates for this word.

Etymograph / intrafilar