Definitions of lobe:

• noun:   a rounded projection that is part of a larger structure
• noun:   (anatomy) a somewhat rounded subdivision of a bodily organ or part

  Example: "Ear lobe"

• noun:   the enhanced response of an antenna in a given direction as indicated by a loop in its radiation pattern
• noun:   (botany) a part into which a leaf is divided
• name:  A surname (very rare: popularity rank in the U.S.: #23639)