vesicle

/ˈvɛsɪkəl/
noun
  1. A small, fluid-filled sac or blister on the skin.
    • The doctor examined the vesicle to determine if it was infected.
    • The rash started with a single vesicle on his arm.
    • She developed a vesicle after touching the poisonous plant.
  2. A small, membrane-bound sac within a cell that stores or transports substances.
    • Scientists observed how the vesicle moved through the cytoplasm.
    • Neurotransmitters are released from a vesicle into the synapse.
    • The cell uses a vesicle to carry proteins to the surface.
  3. A small, fluid-filled cavity in a plant or animal body.
    • In some animals, a vesicle stores waste before it is expelled.
    • The biologist found a vesicle inside the leaf tissue.
    • The air vesicle helps the plant float on water.