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

• rebut
• rebuttable
• rebuttal
• rebutter
• rec room
• recalcitrance
• recalcitrancy
• recalcitrant
• recalcitrate
• recalculate
• recalculation
• recall
• recall dose
• recant
• recantation
• recap
• recapitulate
• recapitulation
• recapture
• recast
• recasting
• recce
• recco
• reccy
• recede