| aleurone | <botany> An albuminoid substance which occurs in minute grains ("protein granules") in maturing seeds and tubers; supposed to be a modification of protoplasm. Origin: Gr. Flour. Source: Websters Dictionary (01 Mar 1998) |
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| aleurone grain | <plant biology> Membrane bounded storage granule within plant cells that usually contains protein. May be an aleuroplast or just a specialised vacuole. (18 Nov 1997) |