hypostosis

hyp·os·to·sis

(hip'os-tō'sis),
Deficient development of bone.
[hypo- + G. osteon, bone, + -osis, condition]

hypostosis

(hĭp″ŏs-tō′sĭs) [″ + osteon, bone, + osis, condition]
Deficient bone development.