back·stay 
(băkstā′)
(băkstā′)n.
1. A rope or cable extending from the top of a mast aft to a vessel's side or stern to help support the mast.
2. A supporting device at or for the back of something else.
- postnasal drip
- postnatal
- postnatally
- postnuptial
- postnuptially
- post office
- post office box
- post-op
- postop
- postoperative
- postoperatively
- postorbital
- postpaid
- postpartum
- post-polio syndrome
- postponable
- postpone
- postponement
- postpose
- postposition
- postpositional
- postpositionally
- postpositive
- postpositively
- postprandial