n.
Pronunciation: ˌ äs-t ē - ō -m ə - ' l ā -sh( ē -) ə
Function: noun
Etymology: New Latin, from oste- + Greek malakia softness, from malakos soft ― more at MOLLIFY
Date: circa 1834
: a disease of adults that is characterized by softening of the bones and is analogous to rickets in the young