死屍 is read as しし (shishi) and means corpse.
しし
shishi
ししるいるい
heaps of corpses all around
しにん
corpse
しけい
death penalty
したい
dead body
しぼう
death
ししゃ
dead person
しきょ
しぬ
to cease
しせい
life and death
しざん
stillbirth
しご
dead language
しぼうりつ
death rate