hypoparathyroidism
Concise Oxford English Dictionary © 2008 Oxford University Press:
hypoparathyroidism /ˌhʌɪpəʊˌparəˈθʌɪrɔɪdɪz(ə)m/
▶noun Medicine diminished concentration of parathyroid hormone in the blood, causing deficiencies of calcium and phosphorus compounds.
– derivatives
hypoparathyroid adjective.
hypoparathyroid adjective.
'hypoparathyroidism' also found in these Oxford entries:

