1. The blood group whose red cells lack the Rh factor (Rh antigen)
   - Rh-negative blood type, Rh negative

Type of: blood group, blood type

• genus Loranthus
• genus Loris
• genus Lota
• genus Lotus
• genus Lovoa
• genus Loxia
• genus Loxodonta
• genus Loxoma
• genus Loxostege
• genus Lucilia
• genus Lufengpithecus
• genus Luffa
• genus Lumpenus
• genus Lunaria
• genus Lunda
• genus Lupinus
• genus Luscinia
• genus Lutjanus
• genus Lutra
• genus Luvarus
• genus Lycaena
• genus Lycaeon
• genus Lychnis
• genus Lycium
• genus Lycoperdon