Thescruple (℈) is a small unit in theapothecaries' system,[1] derived from the oldRomanscrupulum (lit. 'small pebble')unit[2] (scrupulus/scrupulum).
The scruple is8⁄175 of anounce (or1⁄24 of a troyounce),1⁄3dram, or 20grains:[1] it is therefore exactly 1.2959782 grams.
TheRoman scruple was 11.875% smaller, therefore being exactly 1.14208078875 grams.
Thefluid scruple is1⁄24fluid ounce,1⁄3fluid dram, 20minims,1⁄4teaspoon, or 1saltspoon.
It is therefore equal to 1.2322304milliliters in the US customary system, or 1.1838776 milliliters in the imperial customary system (to eight significant figures).