Mid 17th century; earliest use found in John Donne (1572–1631), poet and Church of England clergyman. From post-classical Latin macilentia: compare -ency.
Definition of macilency in US English:
macilency
nounˈmasɪl(ə)nsi
rare
Thinness, leanness.
Origin
Mid 17th century; earliest use found in John Donne (1572–1631), poet and Church of England clergyman. From post-classical Latin macilentia: compare -ency.