Covered with small spots, flecks, or marks; speckled (archaic or dialectal variant).
From 'be-' prefix plus 'specked' (covered with specks). This appears to be a variant or archaic form of 'bespeckled,' following the same pattern as other 'be-' adjectives.
Language variation is fascinating—'bespecked' and 'bespeckled' are both valid in different regions or time periods, showing how dialects and historical usage create multiple forms for the same meaning, and we have to decide which one becomes standard.
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