The meaning of the Acronym OB is...

OB is

• Occult Blood

More Meanings For OB:

• Object cut/paste file (IBM LinkWay)
• Output Block
• Other Board
• Object Bus
• Overflow Bucket
• Option Button
• Obnoxious Because
• Old Buddy
• Oligosaccharide Binding
• Optical Bar
• Outer Banks
• Ornery Brat
• One Big
• Oh Baby
• Our Beds

OB is also in:

• Adults
• Chat
• Chemistry
• Electronics
• File Extensions
• General
• Ocean Science