A person who conds or surveys something, particularly used in salt-making; a person who oversees or directs the production process.
From the verb 'cond' (to oversee salt production), derived from an obscure origin possibly related to conducting or directing. This is a highly specialized historical term from the salt industry.
A conder was an essential worker in medieval and early modern salt works—they had to judge the precise moment when salt crystals were ready, using experience and intuition since they had no thermometers or modern equipment.
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