1. Global System for Mobile, an international standard for mobile phones

Encyclopedia: GSM

• outwards
• outwear
• outweigh
• outweird
• outwit
• outwith
• outwork
• ouzel
• ouzo
• OV
• oval
• oval kumquat
• Oval Office
• oval window
• oval-bodied
• oval-fruited
• oval-shaped
• ovalbumin
• Ovalipes
• Ovalipes ocellatus
• ovarian
• ovarian artery
• ovarian cyst
• ovarian pregnancy
• ovarian vein