A person or device that dilks; specifically, one who works with or manipulates materials in certain industrial or manufacturing processes (archaic or dialect).
From dil or dilk (possibly from Middle English or dialect origins) plus -er suffix (forming agent nouns). The original meaning and etymology are obscure, appearing mostly in regional or historical texts.
Words like 'dilker' haunt etymology dictionaries because their meanings have been lost to time—we see the word in old texts but don't know what a dilker actually did!
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