1. The blood group whose red cells carry neither the A nor B antigens
   - O, type O

Type of: blood group, blood type

• time zone
• time-and-motion study
• time-ball
• time-consuming
• time-delay measuring instrument
• time-delay measuring system
• time-fuse
• time-honored
• time-honoured
• time-lapse
• time-motion study
• time-out
• time-release
• time-scale factor
• time-switch
• time-tested
• timecard
• timed
• timekeeper
• timekeeping
• timeless
• timeless existence
• timelessly
• timelessness
• timeline