chloroplast

[klawr-uh-plast, klohr-]
noun Botany.
a plastid containing chlorophyll.

Origin:
1885–90; chloro(phyll) + -plast

chloroplastic, adjective
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Collins
World English Dictionary
chloroplast (ˈklɔːrəʊˌplæst)
 
n
a plastid containing chlorophyll and other pigments, occurring in plants and algae that carry out photosynthesis
 
chloro'plastic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

chloroplast
1887, from Ger. chloroplastid (1884), from chloro- comb. form of Latinized form of Gk. khloros + -plast.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
chloroplast  [%PREMIUM_LINK%]     (klôr'ə-plāst')  Pronunciation Key 
A plastid in the cells of green plants and green algae that contains chlorophylls and carotenoid pigments and creates glucose through photosynthesis. In plants, chloroplasts are usually disk-shaped and can reorient themselves in the cell to vary their exposure to sunlight. Chloroplasts contain the saclike membranes known as thylakoids, which contain the chlorophyll and are arranged in stacklike structures known as grana. Besides conducting photosynthesis, plant chloroplasts store starch and are involved in amino acid synthesis. Like mitochondria, chloroplasts have their own DNA that is different from the DNA in the nucleus, and chloroplasts are therefore believed to have evolved from symbiont bacteria, their DNA being a remnant of their past existence as independent organisms. See more at cell, photosynthesis.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

chloroplast definition


A chlorophyll-containing organelle found in algal and green plant cells.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Researchers have recently made a first attempt at artificially creating a chloroplast in a non-photosynthetic organism.
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