thylakoid 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 disk-shaped, membranous sac containing chlorophyll, in which the light reaction of photosynthesis occurs, found in blue-green algae and in the chloroplasts of green plants
thylakoid definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A saclike membrane that is the structural unit of the grana in the chloroplasts of plant cells.
Origin: Greek thūlakos, sack + -oid.
thylakoid - Science Definition
A saclike membrane that contains the chlorophyll in cyanobacteria and in the chloroplasts of plant cells and green algae. In chloroplasts, thylakoids are arranged in stacks called grana.