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Any of several cytoplasmic organelles, such as chloroplasts, that contain genetic material, have a double membrane, and are often pigmented. Plastids are found in plants, algae, and certain other eukaryotic organisms and have various physiological functions, such as the synthesis and storage of food.
[From Greek plastis, plastid-, feminine of plastēs, molder, from plastos, molded; see plastic.]
plas·tid′i·al (plăs-tĭd′ē-əl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Botany) any of various small particles in the cytoplasm of the cells of plants and some animals that contain pigments, starch, oil, protein, etc. See chromoplast
[C19: via German from Greek plastēs sculptor, from plassein to form]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a small, double-membraned organelle of plant cells and certain protists, occurring in several varieties, as the chloroplast, and containing ribosomes, prokaryotic DNA, and, often, pigment.
[1875–80; < German Plastide < Greek plastid-, s. of plástis, feminine derivative of plástēs modeler, creator, derivative of plássein to form]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
A structure found in plant cells, green algae, and certain protozoans. Some plastids, such as the chloroplasts in plant leaves, contain pigments.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||plastid - any of various small particles in the cytoplasm of the cells of plants and some animals containing pigments or starch or oil or protein|
granule - a tiny grain
chromoplast - plastid containing pigments other than chlorophyll usually yellow or orange carotenoids
chloroplast - plastid containing chlorophyll and other pigments; in plants that carry out photosynthesis
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