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