Definitions of carrot:

• noun:   promise of reward as in "carrot and stick"

  Example: "Used the carrot of subsidized housing for the workers to get their vote"

• noun:   orange root; important source of carotene
• noun:   perennial plant widely cultivated as an annual in many varieties for its long conical deep-orange edible roots; temperate and tropical regions
• noun:   deep orange edible root of the cultivated carrot plant