Resembling, containing, or full of cinders; having the characteristic appearance or texture of cinders.
From cinder + -y (English suffix forming adjectives meaning 'full of' or 'like'). Similar formation to 'ashy' or 'dusty,' this everyday adjective developed for describing ash-covered or ash-like materials.
People in coal-era towns would have used 'cindery' constantly to describe everything from their clothes to their window sills—the whole environment was covered in this distinctive residue.
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