apyknomorphous
Pronunciation: ă-pik′nō-mōr′fŭs
Definition: Denoting a cell or other structure that does not stain deeply because the stainable or chromophil material is not closely aggregated.
[G. a- priv. + pyknos, thick, + morphē, shape, form]
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Examples: glitazone, GI cocktail, etc.

