1. A classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and O
   - ABO blood group system, ABO system

Type of: classification system

• lash out
• lash together
• lash-like
• lash-up
• lasher
• lashing
• lashings
• Lashkar-e-Jhangvi
• Lashkar-e-Omar
• Lashkar-e-Taiba
• Lashkar-e-Tayyiba
• Lashkar-e-Toiba
• LASIK
• Lasiocampa
• lasiocampid
• lasiocampid moth
• Lasiocampidae
• Lasiurus
• Lasiurus borealis
• Lasix
• Laskar Jihad
• lass
• Lassa
• Lassa fever
• Lassa virus