periplast
American Heritage Dictionary:
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per·i·plast
(pĕr'ə-plăst') 
n.
n.
- An outer layer surrounding the cell membrane of certain microorganisms, such as a spirochete.
- A cell membrane or cell wall.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Mentioned in
Euglenophyta
(algea, division)
Cryptophyceae
(algae – rhodophycota, euglenophycota, chromophycota, chlorophycota)