- 1. A concretion formed around a grain of sand or other foreign body within the shell of certain mollusks. 2. One of a number of small tough masses, such as mucus occurring in the sputum in asthma. 3. SYN: keratin p..- Elschnig pearls focal retention of lens fibers that have undergone proliferative and degenerative changes surrounded by lens capsular fragments seen after extracapsular cataract extraction.- Epstein pearls multiple small, white, epithelial inclusion cysts found in the midline of the palate in newborn infants.- keratin p. a focus of central keratinization within concentric layers of abnormal squamous cells; seen in squamous cell carcinoma. SYN: epithelial nest, epithelial p., p. (3), squamous p..- Laënnec pearls obsolete term for small, round, translucent, tenacious bodies in the sputum of some persons with asthma; when floated in water, they become unfurled and are then recognizable as Curschmann spirals.
* * *pearl 'pərl n1) PERLE2) one of the rounded concentric masses of squamous epithelial cells characteristic of certain tumors3) a miliary leproma of the iris4) a rounded abnormal mass of enamel on a tooth
* * *(purl) 1. a small rounded mass or body. 2. a rounded mass of tough sputum as seen in the early stages of an attack of bronchial asthma. 3. a small medicated granule, or a glass globule with a single dose of volatile medicine, as amyl nitrite.
Medical dictionary. 2011.