1. (used especially of machinery) not protected by a shield

See also: unprotected

• Office of Management and Budget
• Office of Naval Intelligence
• Office of the Dead
• office staff
• office-bearer
• officeholder
• officer
• officer's mess
• official
• official document
• official emissary
• official immunity
• officialdom
• officialese
• officialise
• officialism
• officialize
• officially
• officiant
• officiate
• officiating
• officiation
• officiator
• officinal
• officious