A person or device that administers doses, especially of medicine or chemicals; someone who measures and distributes measured amounts.
From 'dose' + '-er' suffix (Old English suffix for an agent or person who performs an action). The '-er' suffix creates an agent noun from a verb or related term.
In chemistry labs, a doser is a precise mechanical device—but historically, a human doser (like a pharmacist's apprentice) had to measure medicines with incredible care because one wrong grain of a substance could kill someone.
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