Leucoplast \Leu"co*plast\ (l[=u]"k[-o]*pl[a^]st), Leucoplastid
\Leu`co*plas"tid\ (-pl[a^]s"t[i^]d), n. [Leuco- + Gr. pla`ssein
to mold.] (Bot.)
One of certain very minute whitish or colorless granules
occurring in the protoplasm of plants and supposed to be the
nuclei around which starch granules will form.
[1913 Webster]