/huy'peuhr par'euh thuy"roy diz'euhm/ , n. Pathol.
overactivity of the parathyroid gland, characterized by softening of the bones, with consequent pain, tenderness, and a tendency to spontaneous fractures, and by muscular weakness and abdominal cramps.
[ 1915-20; HYPER- + PARATHYROID + -ISM ]