vesicle
noun
[ ˈvɛsɪk(ə)l ]
• a small fluid-filled bladder, sac, cyst, or vacuole within the body.
• an air-filled swelling in a plant, especially a seaweed.
• a small cavity in volcanic rock, produced by gas bubbles.
Origin:
late 16th century: from French vésicule or Latin vesicula, diminutive of vesica ‘bladder’.
