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

• airframe
• airfreight
• airgun
• airhead
• airheaded
• airily
• airiness
• airing
• airing cupboard
• airless
• airlift
• airlike
• airline
• airline business
• airliner
• airlock
• airmail
• airmail letter
• airmailer
• airman
• airmanship
• airpark
• airplane
• airplane landing
• airplane maneuver