Slight Boxer, Weighing No More Than 112 Lb/51 Kg
Puzzle 19 of Tolkien Universe Medium Pack
Question is: Slight Boxer, Weighing No More Than 112 Lb/51 Kg
and the answer is: FLYWEIGHT
Word Meaning:
FLYWEIGHT — (mechanics) A weight that moves outward depending on centrifugal force.
Definitions from Wiktionary.