bulla

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. (pathology) an elevation of the skin filled with serous fluid
• Syn:
blister, bleb
• Derivationally related forms:
blebby (for: bleb), blistery (for: blister), blister (for: blister)
• Topics:
pathology
• Hypernyms:
vesicle, cyst
• Hyponyms:
water blister, blood blister, pustule
2. the round leaden seal affixed to a papal bull
• Hypernyms:
seal, stamp