peri·plast | \ ˈper-ə-ˌplast 
\
\Definition of periplast
: plasma membrane also : a proteinaceous subcellular layer below the plasma membrane especially of a euglena
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periplast
nounperi·plast | \ ˈper-ə-ˌplast \
\Medical Definition of periplast
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Time Traveler for periplast
The first known use of periplast was in 1853
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