Word Study
    slickensides
CIDE DICTIONARY
slickensides, n. 
                                            -                                     The smooth, striated, or partially polished surfaces of a fissure or seam, supposed to have been produced by the sliding of one surface on another. [1913 Webster]
 -                                     A variety of galena found in Derbyshire, England. [1913 Webster]
 
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