1. Vitally important
   "a life-and-death struggle"
   - life-or-death

See also: crucial, important

• family Liliaceae
• family Limacidae
• family Limulidae
• family Linaceae
• family line
• family Liopelmidae
• family Liparidae
• family Liparididae
• family Lithodidae
• family Littorinidae
• family Loasaceae
• family Lobeliaceae
• family Lobotidae
• family Locustidae
• family Loganiaceae
• family Lomariopsidaceae
• family Lophiidae
• family Lophosoriaceae
• family Loranthaceae
• family Lorisidae
• family Loxomataceae
• family Lucanidae
• family Lutjanidae
• family Luvaridae
• family Lycaenidae