radiate

Radiate is a learned borrowing from Latin radiātus, the perfect passive participle of radiō, meaning 'to furnish with spokes' or 'to give out rays, shine.' That verb, in turn, comes from radius, meaning 'a spoke' or 'a ray.'

The word entered English carrying its Latin sense of shining or sending out rays, and later also gave rise to an adjective and a noun form, the latter through the taxonomic name Radiata.

Radiate shares its root with radius, the Latin word for a spoke or ray, which is where the sense of lines extending outward from a center comes from.