| open-hearth | (adj) of or relating to or produced by the open-hearth process, Example: open-hearth steel |
| open-hearth furnace | (n) a furnace for making steel in which the steel is placed on a shallow hearth and flames of burning gas and hot air play over it |
| open-hearth process | (n) a process for making steel using an open-hearth furnace |
| open-heart surgery | (n) heart surgery in which the rib cage is spread open, the heart is stopped and blood is detoured through a heart-lung machine while a heart valve or coronary artery is surgically repaired |
| Open-headed | a. Bareheaded. [ Obs. ] [ 1913 Webster ] |
| Open-hearted | a. Candid; frank; generous. Dryden. -- |
| Open-hearth steel | . See under Open. [ Webster 1913 Suppl. ] |