An archaic or regional term possibly referring to a type of plant with smoke-like appearance, or a variant spelling of a botanical term.
Possibly from Greek 'kapnos' (smoke) and 'moros' (foolish) or a botanical compound, but etymology is uncertain and usage is largely obsolete.
This word is so obscure that it's essentially vanished from English—it's the kind of term that appears in historical dictionaries but nowhere in modern use.
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