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pearl (purl)   a smooth lustrous deposit found in certain mollusks, valued as a gem.
  something resembling this structure, either because of being round and hard or because of being considered valuable.
  a rounded mass of tough sputum, as seen in the early stages of an attack of asthma.
 

epidermic pearls  , epithelial pearls  rounded concentric masses of epithelial cells found in certain papillomas and epitheliomas.

LaĆ«nnec pearls  soft casts of the smaller bronchial tubes expectorated in bronchial asthma; see also Curschmann spirals.





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