壊疽 is read as えそ (eso) and means gangrene.
えそ
eso
がすえそ
gas gangrene
はいえそ
pulmonary gangrene
こわす
to break (a bill, etc.)
こわれる
to break (down)
かいめつ
(complete) destruction
えし
necrosis
かいへんまいふん
disintegration per minute
かいこく
destroying a country
こわれもの
broken article
かいへん
(radioactive) decay
かいへんまいびょう
decays per second
かいけつびょう
scurvy