a colorless plastid in the cells of roots, storage organs, and underground stems, serving as a point around which starch forms.
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British Dictionary definitions for leucoplast
any of the small colourless bodies occurring in the cytoplasm of plant cells and used for storing food material, esp starch
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012