1843, in the meaning defined above
How many scruples in a dram?
The origins of 8 units of measurement
“Measuring worm.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/measuring%20worm. Accessed 27 Feb. 2025.
measuring worm
Britannica.com: Encyclopedia article about measuring worm
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