callose definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a carbohydrate in plant cells that plugs the sieve pores when the sieve tubes stop functioning
Origin: ; from Classical Latin callosus, callous
callose definition by American Heritage Dictionary
A complex branched carbohydrate commonly associated with sieve areas of sieve elements.
Origin: From Latin callōsus, callous; see callous.