__ Bone Disease, Aka Osteogenesis Imperfecta
Puzzle 19 of Predators Hard Pack
Question is: __ Bone Disease, Aka Osteogenesis Imperfecta
and the answer is: BRITTLE
Word Meaning:
BRITTLE — Inflexible; liable to break, snap, or shatter easily under stress, pressure, or impact.
Definitions from Wiktionary.