Resistance to thyroid hormone is a genetic condition where some body tissues do not respond normally to thyroid hormones produced by the thyroid gland. It may be associated with no symptoms or with features of both an overactive and underactive thyroid.
Relaxin is a hormone produced by the ovary and the placenta with important effects in the female reproductive system and during pregnancy. In preparation for childbirth, it relaxes the ligaments in the pelvis and softens and widens the cervix.
Rickets is a condition in children where there is abnormal softening of the bones due to lack of minerals to strengthen it. It is also known as osteomalacia in adults.