1. The external margin of the aperture of a shell 
2. An organ in insects and crustaceans covering the upper part of the mouth, and serving as an upper lip 
3. A lip or edge, as of a basin

Derived forms: labra

Encyclopedia: Labrum

• ad-libber
• ADA
• ADA-SCID
• adactylia
• adactylism
• adactylous
• adactyly
• Adad
• adage
• adagio
• Adalia
• Adalia bipunctata
• Adam
• Adam Smith
• Adam's apple
• Adam's needle
• Adam's needle-and-thread
• Adam's Peak
• adam-and-eve
• adamance
• adamant
• adamantine
• adamantly
• Adams
• Adams-Stokes syndrome