Apothecaries’ Weight Equal to 20 Grains
Puzzle 16 of Famous Horses Hard Pack
Question is: Apothecaries’ Weight Equal to 20 Grains
and the answer is: SCRUPLE
Word Meaning:
SCRUPLE — Hesitation to act from the difficulty of determining what is right or expedient; doubt, hesitation or unwillingness due to motives of conscience; moral qualm.
Definitions from Wiktionary.