Definition:Roman Weights and Measures/Mass/Scrupulus/Linguistic Note

Linguistic Note on Scrupulus
The word scrupulus is the diminutive form of the Latin word scrupus, meaning sharp stone.

Its plural form is scrupuli.

Its secondary meaning of anxiety, uneasiness, doubt, and so on, evolved into the present-day scruple, which can be interpreted to mean a concern about personal morality.