Emaciation

n.	1.	The act of making very lean.
	2.	The state of being emaciated or reduced to excessive leanness; an excessively lean condition.

Noun

1.

emaciation - extreme leanness (usually caused by starvation or disease) Synonyms: bonyness, gauntness, maceration

bonyness, emaciate, gauntness, leanness, macerate, maceration, thinness, waste