Containing or filled with dottle; (of a pipe) having dottle in it.
From 'dottle' plus the adjectival suffix '-ed', which marks past participles and adjectives describing a state or possession.
The '-ed' suffix is fascinating because it's doing double duty here—it marks something that has been done (like 'marked' or 'spotted') but also just indicates possession or a state, which is why 'dottled' sounds right for 'containing dottle.'
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