from The Century Dictionary and Cyclopedia
- n. Maidenly chastity: in allusion to the girdle worn by Greek and Roman marriageable virgins, which, upon marriage, was unloosed.
Sorry, no etymologies found.
After sternly warning the youth against "breaking [Miranda's] virgin-knot before all sanctimonious ceremonies may with full and holy rite be minist'red" (IV. i.15), the wizard summons 'spirits' to perform the blessing mini-play of the masque.