An instrument for measuring the amount of drool or saliva in the mouth.
From the Greek prefix 'be-' (meaning around or by), 'sialon' (saliva), and '-meter' (measure). This is a technical term combining Greek roots to describe a measurement device related to salivation.
This is a hilariously specific medical instrument that most people will never encounter—it's so specialized that even many doctors might not know it! It was probably created in the 19th century when scientists were obsessed with measuring everything.
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