bulb

noun
  1. A rounded underground storage organ present in some plants, consisting of a short stem surrounded by fleshy scale leaves or leaf bases, which contain nutrients. noun
    The gardener planted tulip bulbs in the fall to ensure a vibrant spring bloom.
    Onions are a common type of bulb that is used in cooking around the world.
  2. A glass or plastic vessel, often shaped like a rounded container, that encloses a filament or other light source, used to produce light. noun
    The light bulb in the living room needs to be replaced because it has burned out.
    Energy-efficient LED bulbs are becoming increasingly popular due to their long lifespan.
  3. A rounded or swollen part of an object, often resembling the shape of a plant bulb. noun
    The bulb of the thermometer expanded as the temperature increased.
    The artist sculpted a bulb at the end of the handle for a unique design.