A small, granular structure or particle within a cell that contains chromium or color-bearing material, related to chromidium.
From 'chroma' (color) plus '-iole' (a diminutive suffix meaning 'small'); a more specific term for tiny colored granules within cells.
These microscopic structures fascinated early biologists because different organisms had wildly different arrangements of them—a hint that cellular organization is more complex and purposeful than anyone initially believed.
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