Of or pertaining to Vesta, the classical goddess of the sacred fire and of the household and the state.Pertaining to or characteristic of a vestal virgin or a nun.n. Among the ancient Romans, a virgin consecrated to Vesta and to the service of watching the sacred fire, which was kept perpetually burning upon her altar.n. Hence A virgin; a woman of spotless chastity; sometimes, a virgin who devotes her life entirely to the service of religion; a nun; a religieuse.n. In entomology: The geometrid moth Sterrha sacraria: popularly so called in England, A gossamer-winged butterfly; any member of the Vestales.