ˌsakrələ̇ˈzāshən, ˌsāk-, -ˌlīˈz- noun
( -s )
Etymology: International Scientific Vocabulary sacral (I) + -ization
: incorporation (as of the last lumbar vertebra or any of its parts) into the sacrum ; specifically : a congenital anomaly in which the fifth lumbar vertebra is fused to the sacrum in varying degrees