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stratum lu·ci·dum | \ -ˈlü-sə-dəm 
\
\ plural strata lucida\ -də \
\Medical Definition of stratum lucidum
: a thin somewhat translucent layer of cells lying superficial to the stratum granulosum and under the stratum corneum especially in thickened parts of the epidermis (as of the palms or the soles of the feet)
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