American Heritage® Dictionary of the English Language, Fourth
Edition - n. A plant cell that differs noticeably in form from
neighboring cells. Century Dictionary and Cyclopedia - n. A term
proposed by Sachs for certain individual cells or tissue-
elements which differ greatly, as regards their contents, from
the surrounding tissues. Such are the resin-cells, tannin-cells,
crystal-cells, etc., found in various plants. - n. In biology,
one of the hypothetical, ultimate elements of living protoplasm,
similar to the gemmules of Darwin, the physiological units of
Herbert Spencer, the biophores of Weismann, etc. - n. botany An
isolated specialised cell found in the midst of an otherwise
homogeneous group of cells in plant tissue. GNU Webster's 1913 -
n. (Bot.) An individual cell, differing greatly from its
neighbours in regard to size, structure, or contents. - idio- +
-blast (Wiktionary) “In all organs, CPT accumulation was
detected in epidermal idioblasts, in some glandular trichomes,
and in groups of idioblast c