pyrenoid 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.
Bot. a small structure within a chloroplast, as in some algae, functioning as a center for starch production
Origin: ; from Classical Greek pyrēn (gen. pyrēnos), pyrene plush -oid
pyrenoid definition by American Heritage Dictionary
A proteinaceous structure found within the chloroplast of certain algae and bryophytes. It is considered to be associated with starch deposition.
Origin: New Latin pȳrēna, fruit stone; see pyrene + -oid.